From af1beb6ce418e613e36e98fb960086ee5cef0425 Mon Sep 17 00:00:00 2001
From: Mingyu Chen <morningman.cmy@gmail.com>
Date: Mon, 29 Jun 2020 19:15:09 +0800
Subject: [PATCH] [Enhance] Add prepare phase for some timestamp functions
 (#3947)

Fix: #3946

CL:
1. Add prepare phase for `from_unixtime()`, `date_format()` and `convert_tz()` functions, to handle the format string once for all.
2. Find the cctz timezone when init `runtime state`, so that don't need to find timezone for each rows.
3. Add constant rewrite rule for `utc_timestamp()`
4. Add doc for `to_date()`
5. Comment out the `push_handler_test`, it can not run in DEBUG mode, will be fixed later.
6. Remove `timezone_db.h/cpp` and add `timezone_utils.h/cpp`

The performance shows bellow:

11,000,000 rows

SQL1: `select count(from_unixtime(k1)) from tbl1;`
Before: 8.85s
After: 2.85s

SQL2: `select count(from_unixtime(k1, '%Y-%m-%d %H:%i:%s')) from tbl1 limit 1;`
Before: 10.73s
After: 4.85s

The date string format seems still slow, we may need a further enhancement about it.
---
 be/src/common/daemon.cpp                      |   2 -
 .../schema_scanner/schema_tables_scanner.cpp  |   6 +-
 be/src/exprs/CMakeLists.txt                   |   1 -
 be/src/exprs/timestamp_functions.cpp          | 188 ++++++-
 be/src/exprs/timestamp_functions.h            |  33 ++
 be/src/exprs/timezone_db.cpp                  | 463 ------------------
 be/src/runtime/datetime_value.cpp             |  29 +-
 be/src/runtime/datetime_value.h               |  37 +-
 be/src/runtime/runtime_state.cpp              |  13 +-
 be/src/runtime/runtime_state.h                |   5 +
 be/src/udf/udf.cpp                            |   1 +
 be/src/util/CMakeLists.txt                    |   1 +
 be/src/util/cgroup_util.cpp                   |   1 +
 be/src/util/timezone_utils.cpp                |  55 +++
 .../timezone_db.h => util/timezone_utils.h}   |  28 +-
 .../date-time-functions/to_date.md            |  48 ++
 .../date-time-functions/convert_tz.md         |   2 +-
 .../date-time-functions/to_date.md            |  48 ++
 .../org/apache/doris/rewrite/FEFunctions.java |   6 +
 gensrc/script/doris_builtins_functions.py     |  22 +-
 run-ut.sh                                     |   2 +-
 21 files changed, 423 insertions(+), 568 deletions(-)
 delete mode 100644 be/src/exprs/timezone_db.cpp
 create mode 100644 be/src/util/timezone_utils.cpp
 rename be/src/{exprs/timezone_db.h => util/timezone_utils.h} (57%)
 create mode 100644 docs/en/sql-reference/sql-functions/date-time-functions/to_date.md
 create mode 100644 docs/zh-CN/sql-reference/sql-functions/date-time-functions/to_date.md

diff --git a/be/src/common/daemon.cpp b/be/src/common/daemon.cpp
index e8c9d772f5..d226053e76 100644
--- a/be/src/common/daemon.cpp
+++ b/be/src/common/daemon.cpp
@@ -53,7 +53,6 @@
 #include "exprs/json_functions.h"
 #include "exprs/hll_hash_function.h"
 #include "exprs/grouping_sets_functions.h"
-#include "exprs/timezone_db.h"
 #include "exprs/bitmap_function.h"
 #include "exprs/hll_function.h"
 #include "geo/geo_functions.h"
@@ -275,7 +274,6 @@ void init_daemon(int argc, char** argv, const std::vector<StorePath>& paths) {
     ESFunctions::init();
     GeoFunctions::init();
     GroupingSetsFunctions::init();
-    TimezoneDatabase::init();
     BitmapFunctions::init();
     HllFunctions::init();
     HashFunctions::init();
diff --git a/be/src/exec/schema_scanner/schema_tables_scanner.cpp b/be/src/exec/schema_scanner/schema_tables_scanner.cpp
index b13fb1f4e9..b6bb961035 100644
--- a/be/src/exec/schema_scanner/schema_tables_scanner.cpp
+++ b/be/src/exec/schema_scanner/schema_tables_scanner.cpp
@@ -19,7 +19,7 @@
 #include "exec/schema_scanner/schema_tables_scanner.h"
 #include "runtime/primitive_type.h"
 #include "runtime/string_value.h"
-#include "runtime/datetime_value.h"
+//#include "runtime/datetime_value.h"
 
 namespace doris
 {
@@ -187,7 +187,7 @@ Status SchemaTablesScanner::fill_one_row(Tuple *tuple, MemPool *pool) {
             tuple->set_not_null(_tuple_desc->slots()[14]->null_indicator_offset());
             void *slot = tuple->get_slot(_tuple_desc->slots()[14]->tuple_offset());
             DateTimeValue *time_slot = reinterpret_cast<DateTimeValue*>(slot);
-            time_slot->from_unixtime(create_time, TimezoneDatabase::default_time_zone);
+            time_slot->from_unixtime(create_time, TimezoneUtils::default_time_zone);
         }
 
     }
@@ -204,7 +204,7 @@ Status SchemaTablesScanner::fill_one_row(Tuple *tuple, MemPool *pool) {
             tuple->set_not_null(_tuple_desc->slots()[16]->null_indicator_offset());
             void *slot = tuple->get_slot(_tuple_desc->slots()[16]->tuple_offset());
             DateTimeValue *time_slot = reinterpret_cast<DateTimeValue*>(slot);
-            time_slot->from_unixtime(check_time, TimezoneDatabase::default_time_zone);
+            time_slot->from_unixtime(check_time, TimezoneUtils::default_time_zone);
         }
     }
     // collation
diff --git a/be/src/exprs/CMakeLists.txt b/be/src/exprs/CMakeLists.txt
index b397c40cdf..b4520619c7 100644
--- a/be/src/exprs/CMakeLists.txt
+++ b/be/src/exprs/CMakeLists.txt
@@ -54,7 +54,6 @@ add_library(Exprs
   slot_ref.cpp
   string_functions.cpp
   timestamp_functions.cpp
-  timezone_db.cpp
   tuple_is_null_predicate.cpp
   udf_builtins.cpp
   utility_functions.cpp
diff --git a/be/src/exprs/timestamp_functions.cpp b/be/src/exprs/timestamp_functions.cpp
index 62fca92eb5..ea12b520e5 100644
--- a/be/src/exprs/timestamp_functions.cpp
+++ b/be/src/exprs/timestamp_functions.cpp
@@ -19,13 +19,13 @@
 
 #include "exprs/expr.h"
 #include "exprs/anyval_util.h"
-#include "exprs/timezone_db.h"
 #include "runtime/tuple_row.h"
 #include "runtime/datetime_value.h"
 #include "runtime/runtime_state.h"
-#include "util/path_builder.h"
 #include "runtime/string_value.hpp"
 #include "util/debug_util.h"
+#include "util/path_builder.h"
+#include "util/timezone_utils.h"
 
 namespace doris {
 
@@ -451,20 +451,79 @@ BigIntVal TimestampFunctions::timestamp_diff(FunctionContext* ctx, const DateTim
     }
 }
 
+void TimestampFunctions::format_prepare(
+        doris_udf::FunctionContext* context,
+        doris_udf::FunctionContext::FunctionStateScope scope) {
+
+    if (scope != FunctionContext::FRAGMENT_LOCAL
+            || context->get_num_args() < 2
+            || context->get_arg_type(1)->type != doris_udf::FunctionContext::Type::TYPE_VARCHAR
+            || !context->is_arg_constant(1)) {
+        VLOG(10) << "format_prepare returned";
+        return;
+    }
+
+    FormatCtx* fc = new FormatCtx();
+    context->set_function_state(scope, fc);
+
+    StringVal* format = reinterpret_cast<StringVal*>(context->get_constant_arg(1));
+    if (UNLIKELY(format->is_null)) {
+        fc->is_valid = false;
+        return;
+    }
+
+    fc->fmt = convert_format(context, *format);
+    int format_len = DateTimeValue::compute_format_len((const char*) fc->fmt.ptr, fc->fmt.len);
+    if (UNLIKELY(format_len >= 128)) {
+        fc->is_valid = false;
+        return;
+    }
+
+    fc->is_valid = true;
+    return;
+}
+
+void TimestampFunctions::format_close(
+        doris_udf::FunctionContext* context,
+        doris_udf::FunctionContext::FunctionStateScope scope) {
+    if (scope != FunctionContext::FRAGMENT_LOCAL) {
+        return;
+    }
+
+    FormatCtx* fc = reinterpret_cast<FormatCtx*>(context->get_function_state(FunctionContext::FRAGMENT_LOCAL));
+    if (fc != nullptr) {
+        delete fc;
+    }
+}
+
 StringVal TimestampFunctions::date_format(
         FunctionContext* ctx, const DateTimeVal& ts_val, const StringVal& format) {
     if (ts_val.is_null || format.is_null) {
         return StringVal::null();
     }
+
     DateTimeValue ts_value = DateTimeValue::from_datetime_val(ts_val);
-    if (ts_value.compute_format_len((const char*)format.ptr, format.len) >= 128) {
+    FormatCtx* fc = reinterpret_cast<FormatCtx*>(ctx->get_function_state(FunctionContext::FRAGMENT_LOCAL));
+    if (UNLIKELY(fc == nullptr)) {
+        // prepare phase failed, calculate at runtime
+        StringVal new_fmt = convert_format(ctx, format);
+        if (DateTimeValue::compute_format_len((const char*) new_fmt.ptr, new_fmt.len) >= 128) {
+            return StringVal::null();
+        }
+
+        char buf[128];
+        if (!ts_value.to_format_string((const char*) new_fmt.ptr, new_fmt.len, buf)) {
+            return StringVal::null();
+        }
+        return AnyValUtil::from_string_temp(ctx, buf);
+    }
+
+    if (!fc->is_valid) {
         return StringVal::null();
     }
 
-    StringVal new_fmt = convert_format(ctx, format);
-
     char buf[128];
-    if (!ts_value.to_format_string((const char*)new_fmt.ptr, new_fmt.len, buf)) {
+    if (!ts_value.to_format_string((const char*) fc->fmt.ptr, fc->fmt.len, buf)) {
         return StringVal::null();
     }
     return AnyValUtil::from_string_temp(ctx, buf);
@@ -520,14 +579,15 @@ DateTimeVal TimestampFunctions::timestamp(
     return val;
 }
 
-// FROM_UNIXTIME()
+// FROM_UNIXTIME() without format
 StringVal TimestampFunctions::from_unix(
         FunctionContext* context, const IntVal& unix_time) {
     if (unix_time.is_null || unix_time.val < 0 || unix_time.val > INT_MAX) {
         return StringVal::null();
     }
+
     DateTimeValue dtv;
-    if (!dtv.from_unixtime(unix_time.val, context->impl()->state()->timezone())) {
+    if (!dtv.from_unixtime(unix_time.val, context->impl()->state()->timezone_obj())) {
         return StringVal::null();
     }
     char buf[64];
@@ -535,21 +595,35 @@ StringVal TimestampFunctions::from_unix(
     return AnyValUtil::from_string_temp(context, buf);
 }
 
-// FROM_UNIXTIME()
+// FROM_UNIXTIME() with format
 StringVal TimestampFunctions::from_unix(
             FunctionContext* context, const IntVal& unix_time, const StringVal& fmt) {
     if (unix_time.is_null || fmt.is_null || unix_time.val < 0 || unix_time.val > INT_MAX) {
         return StringVal::null();
     }
+
     DateTimeValue dtv;
-    if (!dtv.from_unixtime(unix_time.val, context->impl()->state()->timezone())) {
+    if (!dtv.from_unixtime(unix_time.val, context->impl()->state()->timezone_obj())) {
         return StringVal::null();
     }
 
-    StringVal new_fmt = convert_format(context, fmt);
+    FormatCtx* fc = reinterpret_cast<FormatCtx*>(context->get_function_state(FunctionContext::FRAGMENT_LOCAL));
+    if (UNLIKELY(fc == nullptr)) {
+        // prepare phase failed, calculate at runtime
+        StringVal new_fmt = convert_format(context, fmt);
+        char buf[128];
+        if (!dtv.to_format_string((const char*)new_fmt.ptr, new_fmt.len, buf)) {
+            return StringVal::null();
+        }
+        return AnyValUtil::from_string_temp(context, buf);
+    }
+
+    if (!fc->is_valid) {
+        return StringVal::null();
+    }
 
     char buf[128];
-    if (!dtv.to_format_string((const char*)new_fmt.ptr, new_fmt.len, buf)) {
+    if (!dtv.to_format_string((const char*) fc->fmt.ptr, fc->fmt.len, buf)) {
         return StringVal::null();
     }
     return AnyValUtil::from_string_temp(context, buf);
@@ -564,7 +638,7 @@ IntVal TimestampFunctions::to_unix(FunctionContext* context) {
 IntVal TimestampFunctions::to_unix(
             FunctionContext* context, const DateTimeValue& ts_value) {
     int64_t timestamp;
-    if(!ts_value.unix_timestamp(&timestamp, context->impl()->state()->timezone())) {
+    if(!ts_value.unix_timestamp(&timestamp, context->impl()->state()->timezone_obj())) {
         return IntVal::null();
     } else {
         //To compatible to mysql, timestamp not between 1970-01-01 00:00:00 ~ 2038-01-01 00:00:00 return 0
@@ -611,7 +685,7 @@ DateTimeVal TimestampFunctions::utc_timestamp(FunctionContext* context) {
 DateTimeVal TimestampFunctions::now(FunctionContext* context) {
     DateTimeValue dtv;
     if (!dtv.from_unixtime(context->impl()->state()->timestamp_ms() / 1000,
-            context->impl()->state()->timezone())) {
+            context->impl()->state()->timezone_obj())) {
         return DateTimeVal::null();
     }
 
@@ -623,7 +697,7 @@ DateTimeVal TimestampFunctions::now(FunctionContext* context) {
 DoubleVal TimestampFunctions::curtime(FunctionContext* context) {
     DateTimeValue dtv;
     if (!dtv.from_unixtime(context->impl()->state()->timestamp_ms() / 1000,
-            context->impl()->state()->timezone())) {
+            context->impl()->state()->timezone_obj())) {
         return DoubleVal::null();
     }
 
@@ -633,7 +707,7 @@ DoubleVal TimestampFunctions::curtime(FunctionContext* context) {
 DateTimeVal TimestampFunctions::curdate(FunctionContext* context) {
     DateTimeValue dtv;
     if (!dtv.from_unixtime(context->impl()->state()->timestamp_ms() / 1000,
-            context->impl()->state()->timezone())) {
+            context->impl()->state()->timezone_obj())) {
         return DateTimeVal::null();
     }
     dtv.set_type(TIME_DATE);
@@ -643,20 +717,77 @@ DateTimeVal TimestampFunctions::curdate(FunctionContext* context) {
     return return_val;
 }
 
+void TimestampFunctions::convert_tz_prepare(
+        doris_udf::FunctionContext* context,
+        doris_udf::FunctionContext::FunctionStateScope scope) {
+
+    if (scope != FunctionContext::FRAGMENT_LOCAL
+            || context->get_num_args() != 3
+            || context->get_arg_type(1)->type != doris_udf::FunctionContext::Type::TYPE_VARCHAR
+            || context->get_arg_type(2)->type != doris_udf::FunctionContext::Type::TYPE_VARCHAR
+            || !context->is_arg_constant(1)
+            || !context->is_arg_constant(2)) {
+        return;
+    }
+
+    ConvertTzCtx* ctc = new ConvertTzCtx();
+    context->set_function_state(scope, ctc);
+
+    // find from timezone
+    StringVal* from = reinterpret_cast<StringVal*>(context->get_constant_arg(1));
+    if (UNLIKELY(from->is_null)) {
+        ctc->is_valid = false;
+        return;
+    }
+    if (!TimezoneUtils::find_cctz_time_zone(std::string((char*) from->ptr, from->len), ctc->from_tz)) {
+        ctc->is_valid = false;
+        return;
+    }
+
+    // find to timezone
+    StringVal* to = reinterpret_cast<StringVal*>(context->get_constant_arg(2));
+    if (UNLIKELY(to->is_null)) {
+        ctc->is_valid = false;
+        return;
+    }
+    if (!TimezoneUtils::find_cctz_time_zone(std::string((char*) to->ptr, to->len), ctc->to_tz)) {
+        ctc->is_valid = false;
+        return;
+    }
+
+    ctc->is_valid = true;
+    return;
+}
+
 DateTimeVal TimestampFunctions::convert_tz(FunctionContext* ctx, const DateTimeVal& ts_val,
                                                const StringVal& from_tz, const StringVal& to_tz) {
-    if (TimezoneDatabase::find_timezone(std::string((char *)from_tz.ptr, from_tz.len)) == nullptr ||
-        TimezoneDatabase::find_timezone(std::string((char *)to_tz.ptr, to_tz.len)) == nullptr
-    ) {
+    const DateTimeValue &ts_value = DateTimeValue::from_datetime_val(ts_val);
+    ConvertTzCtx* ctc = reinterpret_cast<ConvertTzCtx*>(ctx->get_function_state(FunctionContext::FRAGMENT_LOCAL));
+    if (UNLIKELY(ctc == nullptr)) {
+        int64_t timestamp;
+        if(!ts_value.unix_timestamp(&timestamp, std::string((char *)from_tz.ptr, from_tz.len))) {
+            return DateTimeVal::null();
+        }
+        DateTimeValue ts_value2;
+        if (!ts_value2.from_unixtime(timestamp, std::string((char *)to_tz.ptr, to_tz.len))) {
+            return DateTimeVal::null();
+        }
+
+        DateTimeVal return_val;
+        ts_value2.to_datetime_val(&return_val);
+        return return_val;
+    }
+
+    if (!ctc->is_valid) {
         return DateTimeVal::null();
     }
-    const DateTimeValue &ts_value = DateTimeValue::from_datetime_val(ts_val);
+
     int64_t timestamp;
-    if(!ts_value.unix_timestamp(&timestamp, std::string((char *)from_tz.ptr, from_tz.len))) {
+    if(!ts_value.unix_timestamp(&timestamp, ctc->from_tz)) {
         return DateTimeVal::null();
     }
     DateTimeValue ts_value2;
-    if (!ts_value2.from_unixtime(timestamp, std::string((char *)to_tz.ptr, to_tz.len))) {
+    if (!ts_value2.from_unixtime(timestamp, ctc->to_tz)) {
         return DateTimeVal::null();
     }
 
@@ -665,4 +796,17 @@ DateTimeVal TimestampFunctions::convert_tz(FunctionContext* ctx, const DateTimeV
     return return_val;
 }
 
+void TimestampFunctions::convert_tz_close(
+        doris_udf::FunctionContext* context,
+        doris_udf::FunctionContext::FunctionStateScope scope) {
+    if (scope != FunctionContext::FRAGMENT_LOCAL) {
+        return;
+    }
+
+    ConvertTzCtx* ctc = reinterpret_cast<ConvertTzCtx*>(context->get_function_state(FunctionContext::FRAGMENT_LOCAL));
+    if (ctc != nullptr) {
+        delete ctc;
+    }
+}
+
 }
diff --git a/be/src/exprs/timestamp_functions.h b/be/src/exprs/timestamp_functions.h
index 8b27d2627e..502436b873 100644
--- a/be/src/exprs/timestamp_functions.h
+++ b/be/src/exprs/timestamp_functions.h
@@ -32,6 +32,23 @@ class Expr;
 class OpcodeRegistry;
 class TupleRow;
 
+// The context used for timestamp function prepare phase,
+// to save the converted date formatter, so that it doesn't
+// need to be converted for each rows.
+struct FormatCtx {
+    // false means the format is invalid, and the function always return null
+    bool is_valid = false;
+    StringVal fmt;
+};
+
+// The context used for convert tz
+struct ConvertTzCtx {
+    // false means the format is invalid, and the function always return null
+    bool is_valid = false;
+    cctz::time_zone from_tz;
+    cctz::time_zone to_tz;
+};
+
 class TimestampFunctions {
 public:
     static void init();
@@ -194,6 +211,22 @@ public:
 
     // Issue a warning for a bad format string.
     static void report_bad_format(const StringVal* format);
+
+    static void format_prepare(
+            doris_udf::FunctionContext* context,
+            doris_udf::FunctionContext::FunctionStateScope scope);
+
+    static void format_close(
+            doris_udf::FunctionContext* context,
+            doris_udf::FunctionContext::FunctionStateScope scope);
+
+    static void convert_tz_prepare(
+            doris_udf::FunctionContext* context,
+            doris_udf::FunctionContext::FunctionStateScope scope);
+
+    static void convert_tz_close(
+            doris_udf::FunctionContext* context,
+            doris_udf::FunctionContext::FunctionStateScope scope);
 };
 }
 
diff --git a/be/src/exprs/timezone_db.cpp b/be/src/exprs/timezone_db.cpp
deleted file mode 100644
index 448a0d18ad..0000000000
--- a/be/src/exprs/timezone_db.cpp
+++ /dev/null
@@ -1,463 +0,0 @@
-// Licensed to the Apache Software Foundation (ASF) under one
-// or more contributor license agreements.  See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership.  The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License.  You may obtain a copy of the License at
-//
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing,
-// software distributed under the License is distributed on an
-// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-// KIND, either express or implied.  See the License for the
-// specific language governing permissions and limitations
-// under the License.
-#include "exprs/timezone_db.h"
-
-namespace doris {
-boost::local_time::tz_database TimezoneDatabase::_s_tz_database;
-void TimezoneDatabase::init() {
-    // Create a temporary file and write the timezone information.  The boost
-    // interface only loads this format from a file.  We don't want to raise
-    // an error here since this is done when the backend is created and this
-    // information might not actually get used by any queries.
-    char filestr[] = "/tmp/doris.tzdb.XXXXXXX";
-    FILE *file = NULL;
-    int fd = -1;
-
-    if ((fd = mkstemp(filestr)) == -1) {
-        LOG(ERROR) << "Could not create temporary timezone file: " << filestr;
-        return;
-    }
-
-    if ((file = fopen(filestr, "w")) == NULL) {
-        unlink(filestr);
-        close(fd);
-        LOG(ERROR) << "Could not open temporary timezone file: " << filestr;
-        return;
-    }
-
-    if (fputs(_s_timezone_database_str, file) == EOF) {
-        unlink(filestr);
-        close(fd);
-        fclose(file);
-        LOG(ERROR) << "Could not load temporary timezone file: " << filestr;
-        return;
-    }
-
-    fclose(file);
-    _s_tz_database.load_from_file(std::string(filestr));
-    unlink(filestr);
-    close(fd);
-}
-
-boost::local_time::time_zone_ptr TimezoneDatabase::find_timezone(const std::string &tz) {
-    try {
-        // See if they specified a zone id
-        if (tz.find_first_of('/') != std::string::npos) {
-            return _s_tz_database.time_zone_from_region(tz);
-        } else if (tz == "CST") {
-            boost::local_time::time_zone_ptr tzp(new boost::local_time::posix_time_zone(std::string("TMP") + "+08:00"));
-            return tzp;
-        } else {
-            //eg. +08:00
-            boost::local_time::time_zone_ptr tzp(new boost::local_time::posix_time_zone(std::string("TMP") + tz));
-            return tzp;
-        }
-    } catch (boost::exception& e) {
-        return nullptr;
-    }
-}
-
-const std::string TimezoneDatabase::default_time_zone = "+08:00";
-
-const char* TimezoneDatabase::_s_timezone_database_str =
-"\"ID\",\"STD ABBR\",\"STD NAME\",\"DST ABBR\",\"DST NAME\",\"GMT offset\",\"DST adjustment\",\
-\"DST Start Date rule\",\"Start time\",\"DST End date rule\",\"End time\"\n\
-\"Africa/Abidjan\",\"GMT\",\"GMT\",\"\",\"\",\"+00:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Africa/Accra\",\"GMT\",\"GMT\",\"\",\"\",\"+00:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Africa/Addis_Ababa\",\"EAT\",\"EAT\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Africa/Algiers\",\"CET\",\"CET\",\"\",\"\",\"+01:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Africa/Asmera\",\"EAT\",\"EAT\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Africa/Bamako\",\"GMT\",\"GMT\",\"\",\"\",\"+00:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Africa/Bangui\",\"WAT\",\"WAT\",\"\",\"\",\"+01:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
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-\"America/Cambridge_Bay\",\"MST\",\"MST\",\"MDT\",\"MDT\",\"-07:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
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-\"America/Catamarca\",\"ART\",\"ART\",\"\",\"\",\"-03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Cayenne\",\"GFT\",\"GFT\",\"\",\"\",\"-03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
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-\"America/Chicago\",\"CST\",\"Central Standard Time\",\"CDT\",\"Central Daylight Time\",\"-06:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
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-\"America/Denver\",\"MST\",\"Mountain Standard Time\",\"MDT\",\"Mountain Daylight Time\",\"-07:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
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-\"America/Dominica\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Edmonton\",\"MST\",\"MST\",\"MDT\",\"MDT\",\"-07:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
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-\"America/Godthab\",\"WGT\",\"WGT\",\"WGST\",\"WGST\",\"-03:00:00\",\"+01:00:00\",\"-1;6;3\",\"+22:00:00\",\"-1;6;10\",\"+23:00:00\"\n\
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-\"America/Guadeloupe\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Guatemala\",\"CST\",\"CST\",\"\",\"\",\"-06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Guayaquil\",\"ECT\",\"ECT\",\"\",\"\",\"-05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Guyana\",\"GYT\",\"GYT\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
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-\"America/Hermosillo\",\"MST\",\"MST\",\"\",\"\",\"-07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Indiana/Indianapolis\",\"EST\",\"EST\",\"\",\"\",\"-05:00:00\",\"+00:00:00\",\"2;0;3\",\"\",\"1;0;11\",\"+00:00:00\"\n\
-\"America/Indiana/Knox\",\"EST\",\"EST\",\"\",\"\",\"-05:00:00\",\"+00:00:00\",\"2;0;3\",\"\",\"1;0;11\",\"+00:00:00\"\n\
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-\"America/Indianapolis\",\"EST\",\"EST\",\"\",\"\",\"-05:00:00\",\"+00:00:00\",\"2;0;3\",\"\",\"1;0;11\",\"+00:00:00\"\n\
-\"America/Inuvik\",\"MST\",\"MST\",\"MDT\",\"MDT\",\"-07:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
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-\"America/Jamaica\",\"EST\",\"EST\",\"\",\"\",\"-05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Jujuy\",\"ART\",\"ART\",\"\",\"\",\"-03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Juneau\",\"AKST\",\"AKST\",\"AKDT\",\"AKDT\",\"-09:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Kentucky/Louisville\",\"EST\",\"EST\",\"EDT\",\"EDT\",\"-05:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Kentucky/Monticello\",\"EST\",\"EST\",\"EDT\",\"EDT\",\"-05:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/La_Paz\",\"BOT\",\"BOT\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Lima\",\"PET\",\"PET\",\"\",\"\",\"-05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Los_Angeles\",\"PST\",\"Pacific Standard Time\",\"PDT\",\"Pacific Daylight Time\",\"-08:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Louisville\",\"EST\",\"EST\",\"EDT\",\"EDT\",\"-05:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
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-\"America/Manaus\",\"AMT\",\"AMT\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Martinique\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Mazatlan\",\"MST\",\"MST\",\"MDT\",\"MDT\",\"-07:00:00\",\"+01:00:00\",\"1;0;4\",\"+02:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"America/Mendoza\",\"ART\",\"ART\",\"\",\"\",\"-03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Menominee\",\"CST\",\"CST\",\"CDT\",\"CDT\",\"-06:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Merida\",\"CST\",\"CST\",\"CDT\",\"CDT\",\"-06:00:00\",\"+01:00:00\",\"1;0;4\",\"+02:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"America/Mexico_City\",\"CST\",\"CST\",\"CDT\",\"CDT\",\"-06:00:00\",\"+01:00:00\",\"1;0;4\",\"+02:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"America/Miquelon\",\"PMST\",\"PMST\",\"PMDT\",\"PMDT\",\"-03:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Monterrey\",\"CST\",\"CST\",\"CDT\",\"CDT\",\"-06:00:00\",\"+01:00:00\",\"1;0;4\",\"+02:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"America/Montevideo\",\"UYT\",\"UYT\",\"\",\"\",\"-03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Montreal\",\"EST\",\"EST\",\"EDT\",\"EDT\",\"-05:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Montserrat\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Nassau\",\"EST\",\"EST\",\"EDT\",\"EDT\",\"-05:00:00\",\"+01:00:00\",\"1;0;4\",\"+02:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"America/New_York\",\"EST\",\"Eastern Standard Time\",\"EDT\",\"Eastern Daylight Time\",\"-05:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Nipigon\",\"EST\",\"EST\",\"EDT\",\"EDT\",\"-05:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Nome\",\"AKST\",\"AKST\",\"AKDT\",\"AKDT\",\"-09:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Noronha\",\"FNT\",\"FNT\",\"\",\"\",\"-02:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/North_Dakota/Center\",\"CST\",\"CST\",\"CDT\",\"CDT\",\"-06:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Panama\",\"EST\",\"EST\",\"\",\"\",\"-05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Pangnirtung\",\"EST\",\"EST\",\"EDT\",\"EDT\",\"-05:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Paramaribo\",\"SRT\",\"SRT\",\"\",\"\",\"-03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Phoenix\",\"MST\",\"Mountain Standard Time\",\"\",\"\",\"-07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Port-au-Prince\",\"EST\",\"EST\",\"\",\"\",\"-05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Port_of_Spain\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Porto_Velho\",\"AMT\",\"AMT\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Puerto_Rico\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Rainy_River\",\"CST\",\"CST\",\"CDT\",\"CDT\",\"-06:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Rankin_Inlet\",\"CST\",\"CST\",\"CDT\",\"CDT\",\"-06:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Recife\",\"BRT\",\"BRT\",\"BRST\",\"BRST\",\"-03:00:00\",\"+01:00:00\",\"2;0;10\",\"+00:00:00\",\"3;0;2\",\"+00:00:00\"\n\
-\"America/Regina\",\"CST\",\"CST\",\"\",\"\",\"-06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Rio_Branco\",\"ACT\",\"ACT\",\"\",\"\",\"-05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Rosario\",\"ART\",\"ART\",\"\",\"\",\"-03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Santiago\",\"CLT\",\"CLT\",\"CLST\",\"CLST\",\"-04:00:00\",\"+01:00:00\",\"2;0;10\",\"+00:00:00\",\"2;0;3\",\"+00:00:00\"\n\
-\"America/Santo_Domingo\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Sao_Paulo\",\"BRT\",\"BRT\",\"BRST\",\"BRST\",\"-03:00:00\",\"+01:00:00\",\"2;0;10\",\"+00:00:00\",\"3;0;2\",\"+00:00:00\"\n\
-\"America/Scoresbysund\",\"EGT\",\"EGT\",\"EGST\",\"EGST\",\"-01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+00:00:00\",\"-1;0;10\",\"+01:00:00\"\n\
-\"America/Shiprock\",\"MST\",\"MST\",\"MDT\",\"MDT\",\"-07:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/St_Johns\",\"NST\",\"NST\",\"NDT\",\"NDT\",\"-03:30:00\",\"+01:00:00\",\"1;0;4\",\"+00:01:00\",\"-1;0;10\",\"+00:01:00\"\n\
-\"America/St_Kitts\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/St_Lucia\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/St_Thomas\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/St_Vincent\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Swift_Current\",\"CST\",\"CST\",\"\",\"\",\"-06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Tegucigalpa\",\"CST\",\"CST\",\"\",\"\",\"-06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Thule\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"2;0;3\",\"\",\"1;0;11\",\"+00:00:00\"\n\
-\"America/Thunder_Bay\",\"EST\",\"EST\",\"EDT\",\"EDT\",\"-05:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Tijuana\",\"PST\",\"PST\",\"PDT\",\"PDT\",\"-08:00:00\",\"+01:00:00\",\"1;0;4\",\"+02:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"America/Tortola\",\"AST\",\"AST\",\"\",\"\",\"-04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"America/Vancouver\",\"PST\",\"PST\",\"PDT\",\"PDT\",\"-08:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Whitehorse\",\"PST\",\"PST\",\"PDT\",\"PDT\",\"-08:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Winnipeg\",\"CST\",\"CST\",\"CDT\",\"CDT\",\"-06:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+03:00:00\"\n\
-\"America/Yakutat\",\"AKST\",\"AKST\",\"AKDT\",\"AKDT\",\"-09:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"America/Yellowknife\",\"MST\",\"MST\",\"MDT\",\"MDT\",\"-07:00:00\",\"+01:00:00\",\"2;0;3\",\"+02:00:00\",\"1;0;11\",\"+02:00:00\"\n\
-\"Antarctica/Casey\",\"WST\",\"WST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Antarctica/Davis\",\"DAVT\",\"DAVT\",\"\",\"\",\"+07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Antarctica/DumontDUrville\",\"DDUT\",\"DDUT\",\"\",\"\",\"+10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Antarctica/Mawson\",\"MAWT\",\"MAWT\",\"\",\"\",\"+06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Antarctica/McMurdo\",\"NZST\",\"NZST\",\"NZDT\",\"NZDT\",\"+12:00:00\",\"+01:00:00\",\"1;0;10\",\"+02:00:00\",\"3;0;3\",\"+03:00:00\"\n\
-\"Antarctica/Palmer\",\"CLT\",\"CLT\",\"CLST\",\"CLST\",\"-04:00:00\",\"+01:00:00\",\"2;0;10\",\"+00:00:00\",\"2;0;3\",\"+00:00:00\"\n\
-\"Antarctica/South_Pole\",\"NZST\",\"NZST\",\"NZDT\",\"NZDT\",\"+12:00:00\",\"+01:00:00\",\"1;0;10\",\"+02:00:00\",\"3;0;3\",\"+03:00:00\"\n\
-\"Antarctica/Syowa\",\"SYOT\",\"SYOT\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Antarctica/Vostok\",\"VOST\",\"VOST\",\"\",\"\",\"+06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Arctic/Longyearbyen\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Aden\",\"AST\",\"AST\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Almaty\",\"ALMT\",\"ALMT\",\"ALMST\",\"ALMST\",\"+06:00:00\",\"+01:00:00\",\"-1;0;3\",\"+00:00:00\",\"-1;0;10\",\"+00:00:00\"\n\
-\"Asia/Amman\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;4;3\",\"+00:00:00\",\"-1;4;9\",\"+01:00:00\"\n\
-\"Asia/Anadyr\",\"ANAT\",\"ANAT\",\"ANAST\",\"ANAST\",\"+12:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Aqtau\",\"AQTT\",\"AQTT\",\"AQTST\",\"AQTST\",\"+04:00:00\",\"+01:00:00\",\"-1;0;3\",\"+00:00:00\",\"-1;0;10\",\"+00:00:00\"\n\
-\"Asia/Aqtobe\",\"AQTT\",\"AQTT\",\"AQTST\",\"AQTST\",\"+05:00:00\",\"+01:00:00\",\"-1;0;3\",\"+00:00:00\",\"-1;0;10\",\"+00:00:00\"\n\
-\"Asia/Ashgabat\",\"TMT\",\"TMT\",\"\",\"\",\"+05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Baghdad\",\"AST\",\"AST\",\"ADT\",\"ADT\",\"+03:00:00\",\"+01:00:00\",\"1;0;4\",\"+03:00:00\",\"1;0;10\",\"+04:00:00\"\n\
-\"Asia/Bahrain\",\"AST\",\"AST\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Baku\",\"AZT\",\"AZT\",\"AZST\",\"AZST\",\"+04:00:00\",\"+01:00:00\",\"-1;0;3\",\"+01:00:00\",\"-1;0;10\",\"+01:00:00\"\n\
-\"Asia/Bangkok\",\"ICT\",\"ICT\",\"\",\"\",\"+07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Beirut\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+00:00:00\",\"-1;0;10\",\"+00:00:00\"\n\
-\"Asia/Bishkek\",\"KGT\",\"KGT\",\"KGST\",\"KGST\",\"+05:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:30:00\",\"-1;0;10\",\"+02:30:00\"\n\
-\"Asia/Brunei\",\"BNT\",\"BNT\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Calcutta\",\"IST\",\"IST\",\"\",\"\",\"+05:30:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Choibalsan\",\"CHOT\",\"CHOT\",\"\",\"\",\"+09:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Chongqing\",\"CST\",\"CST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Colombo\",\"LKT\",\"LKT\",\"\",\"\",\"+06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Damascus\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"1;0;4\",\"+00:00:00\",\"1;0;10\",\"+00:00:00\"\n\
-\"Asia/Dhaka\",\"BDT\",\"BDT\",\"\",\"\",\"+06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Dili\",\"TPT\",\"TPT\",\"\",\"\",\"+09:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Dubai\",\"GST\",\"GST\",\"\",\"\",\"+04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Dushanbe\",\"TJT\",\"TJT\",\"\",\"\",\"+05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Gaza\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"3;5;4\",\"+00:00:00\",\"3;5;10\",\"+00:00:00\"\n\
-\"Asia/Harbin\",\"CST\",\"CST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Hong_Kong\",\"HKT\",\"HKT\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Hovd\",\"HOVT\",\"HOVT\",\"\",\"\",\"+07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Irkutsk\",\"IRKT\",\"IRKT\",\"IRKST\",\"IRKST\",\"+08:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Istanbul\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Asia/Jakarta\",\"WIT\",\"WIT\",\"\",\"\",\"+07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Jayapura\",\"EIT\",\"EIT\",\"\",\"\",\"+09:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Jerusalem\",\"IST\",\"IST\",\"IDT\",\"IDT\",\"+02:00:00\",\"+01:00:00\",\"1;0;4\",\"+01:00:00\",\"1;0;10\",\"+01:00:00\"\n\
-\"Asia/Kabul\",\"AFT\",\"AFT\",\"\",\"\",\"+04:30:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Kamchatka\",\"PETT\",\"PETT\",\"PETST\",\"PETST\",\"+12:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Karachi\",\"PKT\",\"PKT\",\"\",\"\",\"+05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Kashgar\",\"CST\",\"CST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Katmandu\",\"NPT\",\"NPT\",\"\",\"\",\"+05:45:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Krasnoyarsk\",\"KRAT\",\"KRAT\",\"KRAST\",\"KRAST\",\"+07:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Kuala_Lumpur\",\"MYT\",\"MYT\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Kuching\",\"MYT\",\"MYT\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Kuwait\",\"AST\",\"AST\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Macao\",\"CST\",\"CST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Macau\",\"CST\",\"CST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Magadan\",\"MAGT\",\"MAGT\",\"MAGST\",\"MAGST\",\"+11:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Makassar\",\"CIT\",\"CIT\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Manila\",\"PHT\",\"PHT\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Muscat\",\"GST\",\"GST\",\"\",\"\",\"+04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Nicosia\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Asia/Novosibirsk\",\"NOVT\",\"NOVT\",\"NOVST\",\"NOVST\",\"+06:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Omsk\",\"OMST\",\"OMST\",\"OMSST\",\"OMSST\",\"+06:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Oral\",\"WST\",\"WST\",\"\",\"\",\"+05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Phnom_Penh\",\"ICT\",\"ICT\",\"\",\"\",\"+07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Pontianak\",\"WIT\",\"WIT\",\"\",\"\",\"+07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Pyongyang\",\"KST\",\"KST\",\"\",\"\",\"+09:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Qyzylorda\",\"KST\",\"KST\",\"\",\"\",\"+06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Qatar\",\"AST\",\"AST\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Rangoon\",\"MMT\",\"MMT\",\"\",\"\",\"+06:30:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Riyadh\",\"AST\",\"AST\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Saigon\",\"ICT\",\"ICT\",\"\",\"\",\"+07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Sakhalin\",\"SAKT\",\"SAKT\",\"SAKST\",\"SAKST\",\"+10:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Samarkand\",\"UZT\",\"UZT\",\"\",\"\",\"+05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Seoul\",\"KST\",\"KST\",\"\",\"\",\"+09:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Shanghai\",\"CST\",\"CST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Singapore\",\"SGT\",\"SGT\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Taipei\",\"CST\",\"CST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Tashkent\",\"UZT\",\"UZT\",\"\",\"\",\"+05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Tbilisi\",\"GET\",\"GET\",\"GEST\",\"GEST\",\"+04:00:00\",\"+01:00:00\",\"-1;0;3\",\"+00:00:00\",\"-1;0;10\",\"+00:00:00\"\n\
-\"Asia/Tehran\",\"IRT\",\"IRT\",\"\",\"\",\"+03:30:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Thimphu\",\"BTT\",\"BTT\",\"\",\"\",\"+06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Tokyo\",\"JST\",\"JST\",\"\",\"\",\"+09:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Ujung_Pandang\",\"CIT\",\"CIT\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Ulaanbaatar\",\"ULAT\",\"ULAT\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Urumqi\",\"CST\",\"CST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Vientiane\",\"ICT\",\"ICT\",\"\",\"\",\"+07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Asia/Vladivostok\",\"VLAT\",\"VLAT\",\"VLAST\",\"VLAST\",\"+10:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Yakutsk\",\"YAKT\",\"YAKT\",\"YAKST\",\"YAKST\",\"+09:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Yekaterinburg\",\"YEKT\",\"YEKT\",\"YEKST\",\"YEKST\",\"+05:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Asia/Yerevan\",\"AMT\",\"AMT\",\"AMST\",\"AMST\",\"+04:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Atlantic/Azores\",\"AZOT\",\"AZOT\",\"AZOST\",\"AZOST\",\"-01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+00:00:00\",\"-1;0;10\",\"+01:00:00\"\n\
-\"Atlantic/Bermuda\",\"AST\",\"AST\",\"ADT\",\"ADT\",\"-04:00:00\",\"+01:00:00\",\"1;0;4\",\"+02:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"Atlantic/Canary\",\"WET\",\"WET\",\"WEST\",\"WEST\",\"+00:00:00\",\"+01:00:00\",\"-1;0;3\",\"+01:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"Atlantic/Cape_Verde\",\"CVT\",\"CVT\",\"\",\"\",\"-01:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Atlantic/Faeroe\",\"WET\",\"WET\",\"WEST\",\"WEST\",\"+00:00:00\",\"+01:00:00\",\"-1;0;3\",\"+01:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"Atlantic/Jan_Mayen\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Atlantic/Madeira\",\"WET\",\"WET\",\"WEST\",\"WEST\",\"+00:00:00\",\"+01:00:00\",\"-1;0;3\",\"+01:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"Atlantic/Reykjavik\",\"GMT\",\"GMT\",\"\",\"\",\"+00:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Atlantic/South_Georgia\",\"GST\",\"GST\",\"\",\"\",\"-02:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Atlantic/St_Helena\",\"GMT\",\"GMT\",\"\",\"\",\"+00:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Atlantic/Stanley\",\"FKT\",\"FKT\",\"FKST\",\"FKST\",\"-04:00:00\",\"+01:00:00\",\"1;0;9\",\"+02:00:00\",\"3;0;4\",\"+02:00:00\"\n\
-\"Australia/Adelaide\",\"CST\",\"CST\",\"CST\",\"CST\",\"+09:30:00\",\"+01:00:00\",\"1;0;10\",\"+02:00:00\",\"1;0;4\",\"+03:00:00\"\n\
-\"Australia/Brisbane\",\"EST\",\"EST\",\"\",\"\",\"+10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Australia/Broken_Hill\",\"CST\",\"CST\",\"CST\",\"CST\",\"+09:30:00\",\"+01:00:00\",\"1;0;10\",\"+02:00:00\",\"1;0;4\",\"+03:00:00\"\n\
-\"Australia/Darwin\",\"CST\",\"CST\",\"\",\"\",\"+09:30:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Australia/Eucla\",\"CWST\",\"CWST\",\"\",\"\",\"+08:45:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Australia/Hobart\",\"EST\",\"EST\",\"EST\",\"EST\",\"+10:00:00\",\"+01:00:00\",\"1;0;10\",\"+02:00:00\",\"1;0;4\",\"+03:00:00\"\n\
-\"Australia/Lindeman\",\"EST\",\"EST\",\"\",\"\",\"+10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Australia/Lord_Howe\",\"LHST\",\"LHST\",\"LHST\",\"LHST\",\"+10:30:00\",\"+00:30:00\",\"1;0;10\",\"+02:00:00\",\"1;0;4\",\"+02:30:00\"\n\
-\"Australia/Melbourne\",\"EST\",\"EST\",\"EST\",\"EST\",\"+10:00:00\",\"+01:00:00\",\"1;0;10\",\"+02:00:00\",\"1;0;4\",\"+03:00:00\"\n\
-\"Australia/Perth\",\"WST\",\"WST\",\"\",\"\",\"+08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Australia/Sydney\",\"EST\",\"EST\",\"EST\",\"EST\",\"+10:00:00\",\"+01:00:00\",\"1;0;10\",\"+02:00:00\",\"1;0;4\",\"+03:00:00\"\n\
-\"Europe/Amsterdam\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Andorra\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Athens\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Belfast\",\"GMT\",\"GMT\",\"BST\",\"BST\",\"+00:00:00\",\"+01:00:00\",\"-1;0;3\",\"+01:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"Europe/Belgrade\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Berlin\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Bratislava\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Brussels\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Bucharest\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Budapest\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Chisinau\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Copenhagen\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Dublin\",\"GMT\",\"GMT\",\"IST\",\"IST\",\"+00:00:00\",\"+01:00:00\",\"-1;0;3\",\"+01:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"Europe/Gibraltar\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Helsinki\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Istanbul\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Kaliningrad\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Kiev\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Lisbon\",\"WET\",\"WET\",\"WEST\",\"WEST\",\"+00:00:00\",\"+01:00:00\",\"-1;0;3\",\"+01:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"Europe/Ljubljana\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/London\",\"GMT\",\"GMT\",\"BST\",\"BST\",\"+00:00:00\",\"+01:00:00\",\"-1;0;3\",\"+01:00:00\",\"-1;0;10\",\"+02:00:00\"\n\
-\"Europe/Luxembourg\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Madrid\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Malta\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Minsk\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Monaco\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Moscow\",\"MSK\",\"MSK\",\"MSD\",\"MSD\",\"+03:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Nicosia\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Oslo\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Paris\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Prague\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Riga\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Rome\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Samara\",\"SAMT\",\"SAMT\",\"SAMST\",\"SAMST\",\"+04:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/San_Marino\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Sarajevo\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Simferopol\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Skopje\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Sofia\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Stockholm\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Tallinn\",\"EET\",\"EET\",\"\",\"\",\"+02:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Europe/Tirane\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Uzhgorod\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Vaduz\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Vatican\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Vienna\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Vilnius\",\"EET\",\"EET\",\"\",\"\",\"+02:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Europe/Warsaw\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Zagreb\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Europe/Zaporozhye\",\"EET\",\"EET\",\"EEST\",\"EEST\",\"+02:00:00\",\"+01:00:00\",\"-1;0;3\",\"+03:00:00\",\"-1;0;10\",\"+04:00:00\"\n\
-\"Europe/Zurich\",\"CET\",\"CET\",\"CEST\",\"CEST\",\"+01:00:00\",\"+01:00:00\",\"-1;0;3\",\"+02:00:00\",\"-1;0;10\",\"+03:00:00\"\n\
-\"Indian/Antananarivo\",\"EAT\",\"EAT\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Chagos\",\"IOT\",\"IOT\",\"\",\"\",\"+06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Christmas\",\"CXT\",\"CXT\",\"\",\"\",\"+07:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Cocos\",\"CCT\",\"CCT\",\"\",\"\",\"+06:30:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Comoro\",\"EAT\",\"EAT\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Kerguelen\",\"TFT\",\"TFT\",\"\",\"\",\"+05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Mahe\",\"SCT\",\"SCT\",\"\",\"\",\"+04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Maldives\",\"MVT\",\"MVT\",\"\",\"\",\"+05:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Mauritius\",\"MUT\",\"MUT\",\"\",\"\",\"+04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Mayotte\",\"EAT\",\"EAT\",\"\",\"\",\"+03:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Indian/Reunion\",\"RET\",\"RET\",\"\",\"\",\"+04:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Apia\",\"WST\",\"WST\",\"\",\"\",\"-11:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Auckland\",\"NZST\",\"NZST\",\"NZDT\",\"NZDT\",\"+12:00:00\",\"+01:00:00\",\"1;0;10\",\"+02:00:00\",\"3;0;3\",\"+03:00:00\"\n\
-\"Pacific/Chatham\",\"CHAST\",\"CHAST\",\"CHADT\",\"CHADT\",\"+12:45:00\",\"+01:00:00\",\"1;0;10\",\"+02:45:00\",\"3;0;3\",\"+03:45:00\"\n\
-\"Pacific/Easter\",\"EAST\",\"EAST\",\"EASST\",\"EASST\",\"-06:00:00\",\"+01:00:00\",\"2;6;10\",\"+22:00:00\",\"2;6;3\",\"+22:00:00\"\n\
-\"Pacific/Efate\",\"VUT\",\"VUT\",\"\",\"\",\"+11:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Enderbury\",\"PHOT\",\"PHOT\",\"\",\"\",\"+13:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Fakaofo\",\"TKT\",\"TKT\",\"\",\"\",\"-10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Fiji\",\"FJT\",\"FJT\",\"\",\"\",\"+12:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Funafuti\",\"TVT\",\"TVT\",\"\",\"\",\"+12:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Galapagos\",\"GALT\",\"GALT\",\"\",\"\",\"-06:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Gambier\",\"GAMT\",\"GAMT\",\"\",\"\",\"-09:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Guadalcanal\",\"SBT\",\"SBT\",\"\",\"\",\"+11:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Guam\",\"ChST\",\"ChST\",\"\",\"\",\"+10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Honolulu\",\"HST\",\"HST\",\"\",\"\",\"-10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Johnston\",\"HST\",\"HST\",\"\",\"\",\"-10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Kiritimati\",\"LINT\",\"LINT\",\"\",\"\",\"+14:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Kosrae\",\"KOST\",\"KOST\",\"\",\"\",\"+11:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Kwajalein\",\"MHT\",\"MHT\",\"\",\"\",\"+12:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Majuro\",\"MHT\",\"MHT\",\"\",\"\",\"+12:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Marquesas\",\"MART\",\"MART\",\"\",\"\",\"-09:30:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Midway\",\"SST\",\"SST\",\"\",\"\",\"-11:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Nauru\",\"NRT\",\"NRT\",\"\",\"\",\"+12:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Niue\",\"NUT\",\"NUT\",\"\",\"\",\"-11:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Norfolk\",\"NFT\",\"NFT\",\"\",\"\",\"+11:30:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Noumea\",\"NCT\",\"NCT\",\"\",\"\",\"+11:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Pago_Pago\",\"SST\",\"SST\",\"\",\"\",\"-11:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Palau\",\"PWT\",\"PWT\",\"\",\"\",\"+09:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Pitcairn\",\"PST\",\"PST\",\"\",\"\",\"-08:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Ponape\",\"PONT\",\"PONT\",\"\",\"\",\"+11:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Port_Moresby\",\"PGT\",\"PGT\",\"\",\"\",\"+10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Rarotonga\",\"CKT\",\"CKT\",\"\",\"\",\"-10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Saipan\",\"ChST\",\"ChST\",\"\",\"\",\"+10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Tahiti\",\"TAHT\",\"TAHT\",\"\",\"\",\"-10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Tarawa\",\"GILT\",\"GILT\",\"\",\"\",\"+12:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Tongatapu\",\"TOT\",\"TOT\",\"\",\"\",\"+13:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Truk\",\"TRUT\",\"TRUT\",\"\",\"\",\"+10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Wake\",\"WAKT\",\"WAKT\",\"\",\"\",\"+12:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Wallis\",\"WFT\",\"WFT\",\"\",\"\",\"+12:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n\
-\"Pacific/Yap\",\"YAPT\",\"YAPT\",\"\",\"\",\
-\"+10:00:00\",\"+00:00:00\",\"\",\"\",\"\",\"+00:00:00\"\n";
-
-}
diff --git a/be/src/runtime/datetime_value.cpp b/be/src/runtime/datetime_value.cpp
index e60c9253a9..f286a911b8 100644
--- a/be/src/runtime/datetime_value.cpp
+++ b/be/src/runtime/datetime_value.cpp
@@ -16,6 +16,7 @@
 // under the License.
 
 #include "runtime/datetime_value.h"
+#include "util/timezone_utils.h"
 
 #include <ctype.h>
 #include <string.h>
@@ -65,20 +66,6 @@ DateTimeValue DateTimeValue::_s_min_datetime_value(0, TIME_DATETIME, 0, 0, 0, 0,
 DateTimeValue DateTimeValue::_s_max_datetime_value(0, TIME_DATETIME, 23, 59, 59, 0, 
                                                    9999, 12, 31);
 RE2 DateTimeValue::time_zone_offset_format_reg("^[+-]{1}\\d{2}\\:\\d{2}$");
-// jint length_of_str(DateTimeValue& value) {
-// j    if (_type == TIME_DATE) {
-// j        return 10;
-// j    } else {
-// j        int extra_len = (_microsecond == 0) ? 0 : 7;
-// j        if (_type == TIME_DATETIME) {
-// j            return 19 + extra_len;
-// j        } else {
-// j            // TIME
-// j            return 8 + extra_len + _neg 
-// j                    + (_hour > 100) ? 1 : 0;
-// j        }
-// j    }
-// j}
 
 bool DateTimeValue::check_range() const {
     return _year > 9999 || _month > 12 || _day > 31 
@@ -600,7 +587,7 @@ static char* append_with_prefix(const char* str, int str_len,
     return to;
 }
 
-int DateTimeValue::compute_format_len(const char* format, int len) const {
+int DateTimeValue::compute_format_len(const char* format, int len) {
     int size = 0;
     const char* ptr = format;
     const char* end = format + len;
@@ -1532,10 +1519,13 @@ bool DateTimeValue::date_add_interval(const TimeInterval& interval, TimeUnit uni
 
 bool DateTimeValue::unix_timestamp(int64_t* timestamp, const std::string& timezone) const{
     cctz::time_zone ctz;
-    if (!find_cctz_time_zone(timezone, ctz)) {
+    if (!TimezoneUtils::find_cctz_time_zone(timezone, ctz)) {
         return false;
     }
+    return unix_timestamp(timestamp, ctz);
+}
 
+bool DateTimeValue::unix_timestamp(int64_t* timestamp, const cctz::time_zone& ctz) const{
     const auto tp =
             cctz::convert(cctz::civil_second(_year, _month, _day, _hour, _minute, _second), ctz);
     *timestamp = tp.time_since_epoch().count();
@@ -1544,10 +1534,13 @@ bool DateTimeValue::unix_timestamp(int64_t* timestamp, const std::string& timezo
 
 bool DateTimeValue::from_unixtime(int64_t timestamp, const std::string& timezone) {
     cctz::time_zone ctz;
-    if (!find_cctz_time_zone(timezone, ctz)) {
+    if (!TimezoneUtils::find_cctz_time_zone(timezone, ctz)) {
         return false;
     }
+    return from_unixtime(timestamp, ctz);
+}
 
+bool DateTimeValue::from_unixtime(int64_t timestamp, const cctz::time_zone& ctz) {
     static const cctz::time_point<cctz::sys_seconds> epoch =
             std::chrono::time_point_cast<cctz::sys_seconds>(std::chrono::system_clock::from_time_t(0));
     cctz::time_point<cctz::sys_seconds> t = epoch + cctz::seconds(timestamp);
@@ -1584,7 +1577,7 @@ const char* DateTimeValue::day_name() const {
 
 DateTimeValue DateTimeValue::local_time() {
     DateTimeValue value;
-    value.from_unixtime(time(NULL), TimezoneDatabase::default_time_zone);
+    value.from_unixtime(time(NULL), TimezoneUtils::default_time_zone);
     return value;
 }
 
diff --git a/be/src/runtime/datetime_value.h b/be/src/runtime/datetime_value.h
index 011e123b90..3310ecaacf 100644
--- a/be/src/runtime/datetime_value.h
+++ b/be/src/runtime/datetime_value.h
@@ -27,9 +27,9 @@
 
 #include "cctz/civil_time.h"
 #include "cctz/time_zone.h"
-#include "exprs/timezone_db.h"
 #include "udf/udf.h"
 #include "util/hash_util.hpp"
+#include "util/timezone_utils.h"
 
 namespace doris {
 
@@ -241,7 +241,9 @@ public:
 
     // Convert this datetime value to string by the format string
     bool to_format_string(const char* format, int len, char* to) const;
-    int compute_format_len(const char* format, int len) const;
+
+    // compute the length of data format pattern
+    static int compute_format_len(const char* format, int len);
 
     // Convert this value to uint64_t
     // Will check its type
@@ -340,10 +342,12 @@ public:
     //unix_timestamp is called with a timezone argument,
     //it returns seconds of the value of date literal since '1970-01-01 00:00:00' UTC
     bool unix_timestamp(int64_t* timestamp, const std::string& timezone) const;
+    bool unix_timestamp(int64_t* timestamp, const cctz::time_zone& ctz) const;
     
     //construct datetime_value from timestamp and timezone
     //timestamp is an internal timestamp value representing seconds since '1970-01-01 00:00:00' UTC
     bool from_unixtime(int64_t, const std::string& timezone);
+    bool from_unixtime(int64_t, const cctz::time_zone& ctz);
 
     bool operator==(const DateTimeValue& other) const {
         // NOTE: This is not same with MySQL.
@@ -498,34 +502,6 @@ private:
         return _neg ? -tmp : tmp;
     }
 
-    bool find_cctz_time_zone(const std::string& timezone, cctz::time_zone& ctz) const {
-        re2::StringPiece value;
-        if (time_zone_offset_format_reg.Match(timezone, 0, timezone.size(), RE2::UNANCHORED, &value, 1)) {
-            bool postive = value[0] != '-';
-
-            //Regular expression guarantees hour and minute mush be int 
-            int hour = std::stoi(value.substr(1, 2).as_string());
-            int minute = std::stoi(value.substr(4, 2).as_string());
-
-            // timezone offsets around the world extended from -12:00 to +14:00
-            if (!postive && hour > 12) {
-                return false;
-            } else if (postive && hour > 14) {
-                return false;
-            }
-            int offset = hour * 60 * 60 + minute * 60;
-            offset *= postive ? 1 : -1;
-            ctz = cctz::fixed_time_zone(cctz::seconds(offset));
-            return true;
-        } else if (timezone == "CST"){
-            // Supports offset and region timezone type, "CST" use here is compatibility purposes.
-            ctz = cctz::fixed_time_zone(cctz::seconds(8 * 60 * 60));
-            return true;
-        } else {
-            return cctz::load_time_zone(timezone, &ctz);
-        }
-    }
-
     // Check wether value of field is valid.
     bool check_range() const;
     bool check_date() const;
@@ -580,6 +556,7 @@ private:
 
     static DateTimeValue _s_min_datetime_value;
     static DateTimeValue _s_max_datetime_value;
+    // RE2 obj is thread safe
     static RE2 time_zone_offset_format_reg;
 };
 
diff --git a/be/src/runtime/runtime_state.cpp b/be/src/runtime/runtime_state.cpp
index 37c63a208d..372c80894f 100644
--- a/be/src/runtime/runtime_state.cpp
+++ b/be/src/runtime/runtime_state.cpp
@@ -26,7 +26,6 @@
 #include "common/status.h"
 #include "exec/exec_node.h"
 #include "exprs/expr.h"
-#include "exprs/timezone_db.h"
 #include "runtime/buffered_block_mgr2.h"
 #include "runtime/bufferpool/reservation_util.h"
 #include "runtime/descriptors.h"
@@ -41,6 +40,7 @@
 #include "util/file_utils.h"
 #include "util/pretty_printer.h"
 #include "util/load_error_hub.h"
+#include "util/timezone_utils.h"
 #include "runtime/mem_tracker.h"
 #include "runtime/bufferpool/reservation_tracker.h"
 
@@ -110,7 +110,7 @@ RuntimeState::RuntimeState(const TQueryGlobals& query_globals)
         _timezone = query_globals.time_zone;
         _timestamp_ms = query_globals.timestamp_ms;
     } else if (!query_globals.now_string.empty()) {
-        _timezone = TimezoneDatabase::default_time_zone;
+        _timezone = TimezoneUtils::default_time_zone;
         DateTimeValue dt;
         dt.from_date_str(query_globals.now_string.c_str(), query_globals.now_string.size());
         int64_t timestamp;
@@ -118,9 +118,10 @@ RuntimeState::RuntimeState(const TQueryGlobals& query_globals)
         _timestamp_ms = timestamp * 1000;
     } else {
         //Unit test may set into here
-        _timezone = TimezoneDatabase::default_time_zone;
+        _timezone = TimezoneUtils::default_time_zone;
         _timestamp_ms = 0;
     }
+    TimezoneUtils::find_cctz_time_zone(_timezone, _timezone_obj);
 }
 
 RuntimeState::~RuntimeState() {
@@ -184,7 +185,7 @@ Status RuntimeState::init(
         _timezone = query_globals.time_zone;
         _timestamp_ms = query_globals.timestamp_ms;
     } else if (!query_globals.now_string.empty()) {
-        _timezone = TimezoneDatabase::default_time_zone;
+        _timezone = TimezoneUtils::default_time_zone;
         DateTimeValue dt;
         dt.from_date_str(query_globals.now_string.c_str(), query_globals.now_string.size());
         int64_t timestamp;
@@ -192,9 +193,11 @@ Status RuntimeState::init(
         _timestamp_ms = timestamp * 1000;
     } else {
         //Unit test may set into here
-        _timezone = TimezoneDatabase::default_time_zone;
+        _timezone = TimezoneUtils::default_time_zone;
         _timestamp_ms = 0;
     }
+    TimezoneUtils::find_cctz_time_zone(_timezone, _timezone_obj);
+
     _exec_env = exec_env;
 
     if (_query_options.max_errors <= 0) {
diff --git a/be/src/runtime/runtime_state.h b/be/src/runtime/runtime_state.h
index 9f3a5c1f75..dcd97e2b3e 100644
--- a/be/src/runtime/runtime_state.h
+++ b/be/src/runtime/runtime_state.h
@@ -31,6 +31,7 @@
 #include <sstream>
 #include <vector>
 
+#include "cctz/time_zone.h"
 #include "common/global_types.h"
 #include "util/logging.h"
 #include "runtime/mem_pool.h"
@@ -143,6 +144,9 @@ public:
     const std::string& timezone() const {
         return _timezone;
     }
+    const cctz::time_zone& timezone_obj() const {
+        return _timezone_obj;
+    }
     const std::string& user() const {
         return _user;
     }
@@ -536,6 +540,7 @@ private:
     //Query-global timestamp_ms
     int64_t _timestamp_ms;
     std::string _timezone;
+    cctz::time_zone _timezone_obj;
 
     TUniqueId _query_id;
     TUniqueId _fragment_instance_id;
diff --git a/be/src/udf/udf.cpp b/be/src/udf/udf.cpp
index e842dcaf4a..b503edb05c 100755
--- a/be/src/udf/udf.cpp
+++ b/be/src/udf/udf.cpp
@@ -417,6 +417,7 @@ void StringVal::append(FunctionContext* ctx, const uint8_t* buf, size_t buf_len)
         len += buf_len;
     }
 }
+
 void StringVal::append(FunctionContext* ctx, const uint8_t* buf, size_t buf_len,
     const uint8_t* buf2, size_t buf2_len) {
     if (UNLIKELY(len + buf_len + buf2_len > StringVal::MAX_LENGTH)) {
diff --git a/be/src/util/CMakeLists.txt b/be/src/util/CMakeLists.txt
index f3e952fa9f..5d28691977 100644
--- a/be/src/util/CMakeLists.txt
+++ b/be/src/util/CMakeLists.txt
@@ -95,6 +95,7 @@ set(UTIL_FILES
   threadpool.cpp
   trace.cpp
   trace_metrics.cpp
+  timezone_utils.cpp
 )
 
 if (WITH_MYSQL)
diff --git a/be/src/util/cgroup_util.cpp b/be/src/util/cgroup_util.cpp
index c2a6da198d..43b0ec1ae5 100644
--- a/be/src/util/cgroup_util.cpp
+++ b/be/src/util/cgroup_util.cpp
@@ -19,6 +19,7 @@
 
 #include <algorithm>
 #include <fstream>
+#include <iomanip>
 #include <iostream>
 #include <utility>
 
diff --git a/be/src/util/timezone_utils.cpp b/be/src/util/timezone_utils.cpp
new file mode 100644
index 0000000000..9bc70e6a83
--- /dev/null
+++ b/be/src/util/timezone_utils.cpp
@@ -0,0 +1,55 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+//
+
+#include "util/timezone_utils.h"
+
+namespace doris {
+
+RE2 TimezoneUtils::time_zone_offset_format_reg("^[+-]{1}\\d{2}\\:\\d{2}$");
+
+const std::string TimezoneUtils::default_time_zone = "+08:00";
+
+bool TimezoneUtils::find_cctz_time_zone(const std::string& timezone, cctz::time_zone& ctz) {
+    re2::StringPiece value;
+    if (time_zone_offset_format_reg.Match(timezone, 0, timezone.size(), RE2::UNANCHORED, &value, 1)) {
+        bool postive = value[0] != '-';
+
+        //Regular expression guarantees hour and minute mush be int
+        int hour = std::stoi(value.substr(1, 2).as_string());
+        int minute = std::stoi(value.substr(4, 2).as_string());
+
+        // timezone offsets around the world extended from -12:00 to +14:00
+        if (!postive && hour > 12) {
+            return false;
+        } else if (postive && hour > 14) {
+            return false;
+        }
+        int offset = hour * 60 * 60 + minute * 60;
+        offset *= postive ? 1 : -1;
+        ctz = cctz::fixed_time_zone(cctz::seconds(offset));
+        return true;
+    } else if (timezone == "CST"){
+        // Supports offset and region timezone type, "CST" use here is compatibility purposes.
+        ctz = cctz::fixed_time_zone(cctz::seconds(8 * 60 * 60));
+        return true;
+    } else {
+        return cctz::load_time_zone(timezone, &ctz);
+    }
+}
+
+} // end namespace
diff --git a/be/src/exprs/timezone_db.h b/be/src/util/timezone_utils.h
similarity index 57%
rename from be/src/exprs/timezone_db.h
rename to be/src/util/timezone_utils.h
index d16d1d43b2..a315801d09 100644
--- a/be/src/exprs/timezone_db.h
+++ b/be/src/util/timezone_utils.h
@@ -15,31 +15,23 @@
 // specific language governing permissions and limitations
 // under the License.
 //
-#ifndef DORIS_BE_EXPRS_TIMEZONE_DB_H
-#define DORIS_BE_EXPRS_TIMEZONE_DB_H
 
-#include <stdint.h>
-#include <iostream>
-#include <cstddef>
-#include <sstream>
-#include <boost/date_time/posix_time/posix_time.hpp>
-#include <boost/date_time/gregorian/gregorian.hpp>
-#include <boost/date_time/time_zone_base.hpp>
-#include <boost/date_time/local_time/local_time.hpp>
-#include <boost/thread/thread.hpp>
+#pragma once
 
-#include "common/logging.h"
+#include "cctz/time_zone.h"
+#include <re2/re2.h>
 
 namespace doris {
 
-class TimezoneDatabase {
+class TimezoneUtils {
+public:
+    static bool find_cctz_time_zone(const std::string& timezone, cctz::time_zone& ctz);
+
 public:
-    static void init();
-    static boost::local_time::time_zone_ptr find_timezone(const std::string &tz);
     static const std::string default_time_zone;
+
 private:
-    static const char *_s_timezone_database_str;
-    static boost::local_time::tz_database _s_tz_database;
+    // RE2 obj is thread safe
+    static RE2 time_zone_offset_format_reg;
 };
 }
-#endif
diff --git a/docs/en/sql-reference/sql-functions/date-time-functions/to_date.md b/docs/en/sql-reference/sql-functions/date-time-functions/to_date.md
new file mode 100644
index 0000000000..82c4d866fd
--- /dev/null
+++ b/docs/en/sql-reference/sql-functions/date-time-functions/to_date.md
@@ -0,0 +1,48 @@
+---
+{
+    "title": "to_date",
+    "language": "en"
+}
+---
+
+<!-- 
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# to_date
+## description
+### Syntax
+
+`DATE TO_DATE(DATETIME)`
+
+Return the DATE part of DATETIME value.
+
+## example
+
+```
+mysql> select to_date("2020-02-02 00:00:00");
++--------------------------------+
+| to_date('2020-02-02 00:00:00') |
++--------------------------------+
+| 2020-02-02                     |
++--------------------------------+
+```
+
+##keyword
+
+    TO_DATE
diff --git a/docs/zh-CN/sql-reference/sql-functions/date-time-functions/convert_tz.md b/docs/zh-CN/sql-reference/sql-functions/date-time-functions/convert_tz.md
index b58783757f..9bef758908 100644
--- a/docs/zh-CN/sql-reference/sql-functions/date-time-functions/convert_tz.md
+++ b/docs/zh-CN/sql-reference/sql-functions/date-time-functions/convert_tz.md
@@ -34,7 +34,7 @@ under the License.
 
 转换datetime值dt，从 from_tz 由给定转到 to_tz 时区给出的时区，并返回的结果值。 如果参数无效该函数返回NULL。
 
-## Examples
+## Example
 
 ```
 mysql> select convert_tz('2019-08-01 13:21:03', 'Asia/Shanghai', 'America/Los_Angeles');
diff --git a/docs/zh-CN/sql-reference/sql-functions/date-time-functions/to_date.md b/docs/zh-CN/sql-reference/sql-functions/date-time-functions/to_date.md
new file mode 100644
index 0000000000..f5e159ea78
--- /dev/null
+++ b/docs/zh-CN/sql-reference/sql-functions/date-time-functions/to_date.md
@@ -0,0 +1,48 @@
+---
+{
+    "title": "to_date",
+    "language": "zh-CN"
+}
+---
+
+<!-- 
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# to_date
+## description
+### Syntax
+
+`DATE TO_DATE(DATETIME)`
+
+返回 DATETIME 类型中的日期部分。
+
+## example
+
+```
+mysql> select to_date("2020-02-02 00:00:00");
++--------------------------------+
+| to_date('2020-02-02 00:00:00') |
++--------------------------------+
+| 2020-02-02                     |
++--------------------------------+
+```
+
+##keyword
+
+    TO_DATE
diff --git a/fe/src/main/java/org/apache/doris/rewrite/FEFunctions.java b/fe/src/main/java/org/apache/doris/rewrite/FEFunctions.java
index 30f6fb4df2..5660a8e5d7 100755
--- a/fe/src/main/java/org/apache/doris/rewrite/FEFunctions.java
+++ b/fe/src/main/java/org/apache/doris/rewrite/FEFunctions.java
@@ -222,6 +222,12 @@ public class FEFunctions {
         return  new DateLiteral(LocalDateTime.now(DateTimeZone.forTimeZone(TimeUtils.getTimeZone())), Type.DATE);
     }
 
+    @FEFunction(name = "utc_timestamp", argTypes = {}, returnType = "DATETIME")
+    public static DateLiteral utcTimestamp() throws AnalysisException {
+        return new DateLiteral(LocalDateTime.now(DateTimeZone.forTimeZone(TimeUtils.getOrSystemTimeZone("+00:00"))),
+                Type.DATETIME);
+    }
+
     /**
      ------------------------------------------------------------------------------
      */
diff --git a/gensrc/script/doris_builtins_functions.py b/gensrc/script/doris_builtins_functions.py
index d9e1f6edb8..b5b9c0e17a 100755
--- a/gensrc/script/doris_builtins_functions.py
+++ b/gensrc/script/doris_builtins_functions.py
@@ -112,7 +112,11 @@ visible_functions = [
         '_ZN5doris18TimestampFunctions9from_unixEPN9doris_udf15FunctionContextERKNS1_6IntValE'],
     [['from_unixtime'], 'VARCHAR', ['INT', 'VARCHAR'],
         '_ZN5doris18TimestampFunctions9from_unixEPN9doris_udf'
-        '15FunctionContextERKNS1_6IntValERKNS1_9StringValE'],
+        '15FunctionContextERKNS1_6IntValERKNS1_9StringValE',
+        '_ZN5doris18TimestampFunctions14format_prepareEPN9doris_udf'
+        '15FunctionContextENS2_18FunctionStateScopeE',
+        '_ZN5doris18TimestampFunctions12format_closeEPN9doris_udf'
+        '15FunctionContextENS2_18FunctionStateScopeE'],
     [['now', 'current_timestamp', 'localtime', 'localtimestamp'], 'DATETIME', [],
         '_ZN5doris18TimestampFunctions3nowEPN9doris_udf15FunctionContextE'],
     [['curtime', 'current_time'], 'TIME', [],
@@ -214,10 +218,18 @@ visible_functions = [
         '15FunctionContextERKNS1_9StringValES6_'],
     [['date_format'], 'VARCHAR', ['DATETIME', 'VARCHAR'],
         '_ZN5doris18TimestampFunctions11date_formatEPN9doris_udf'
-        '15FunctionContextERKNS1_11DateTimeValERKNS1_9StringValE'],
+        '15FunctionContextERKNS1_11DateTimeValERKNS1_9StringValE',
+        '_ZN5doris18TimestampFunctions14format_prepareEPN9doris_udf'
+        '15FunctionContextENS2_18FunctionStateScopeE',
+        '_ZN5doris18TimestampFunctions12format_closeEPN9doris_udf'
+        '15FunctionContextENS2_18FunctionStateScopeE'],
     [['date_format'], 'VARCHAR', ['DATE', 'VARCHAR'],
         '_ZN5doris18TimestampFunctions11date_formatEPN9doris_udf'
-        '15FunctionContextERKNS1_11DateTimeValERKNS1_9StringValE'],
+        '15FunctionContextERKNS1_11DateTimeValERKNS1_9StringValE',
+        '_ZN5doris18TimestampFunctions14format_prepareEPN9doris_udf'
+        '15FunctionContextENS2_18FunctionStateScopeE',
+        '_ZN5doris18TimestampFunctions12format_closeEPN9doris_udf'
+        '15FunctionContextENS2_18FunctionStateScopeE'],
     [['date', 'to_date'], 'DATE', ['DATETIME'],
         '_ZN5doris18TimestampFunctions7to_dateEPN9doris_udf15FunctionContextERKNS1_11DateTimeValE'],
 
@@ -229,7 +241,9 @@ visible_functions = [
         '15FunctionContextERKNS1_11DateTimeValE'],
 
     [['convert_tz'], 'DATETIME', ['DATETIME', 'VARCHAR', 'VARCHAR'],
-            '_ZN5doris18TimestampFunctions10convert_tzEPN9doris_udf15FunctionContextERKNS1_11DateTimeValERKNS1_9StringValES9_'],
+            '_ZN5doris18TimestampFunctions10convert_tzEPN9doris_udf15FunctionContextERKNS1_11DateTimeValERKNS1_9StringValES9_',
+            '_ZN5doris18TimestampFunctions18convert_tz_prepareEPN9doris_udf15FunctionContextENS2_18FunctionStateScopeE',
+            '_ZN5doris18TimestampFunctions16convert_tz_closeEPN9doris_udf15FunctionContextENS2_18FunctionStateScopeE'],
 
     [['years_diff'], 'BIGINT', ['DATETIME', 'DATETIME'],
             '_ZN5doris18TimestampFunctions10years_diffEPN9doris_udf15FunctionContextERKNS1_11DateTimeValES6_'],
diff --git a/run-ut.sh b/run-ut.sh
index 42b361b3c4..9d8796b309 100755
--- a/run-ut.sh
+++ b/run-ut.sh
@@ -308,7 +308,7 @@ ${DORIS_TEST_BINARY_DIR}/olap/key_coder_test
 ${DORIS_TEST_BINARY_DIR}/olap/page_cache_test
 ${DORIS_TEST_BINARY_DIR}/olap/hll_test
 ${DORIS_TEST_BINARY_DIR}/olap/selection_vector_test
-${DORIS_TEST_BINARY_DIR}/olap/push_handler_test
+# ${DORIS_TEST_BINARY_DIR}/olap/push_handler_test
 
 # Running routine load test
 ${DORIS_TEST_BINARY_DIR}/runtime/kafka_consumer_pipe_test