diff --git a/src/common/backend/utils/adt/formatting.cpp b/src/common/backend/utils/adt/formatting.cpp
index 95d5b050f..d31bb4321 100644
--- a/src/common/backend/utils/adt/formatting.cpp
+++ b/src/common/backend/utils/adt/formatting.cpp
@@ -2259,7 +2259,7 @@ static void parse_format(
 #define A_FORMAT_INTERVAL_YEAR2 "YY-MM"
 #define A_FORMAT_INTERVAL_YEAR3 "YYY-MM"
 #define A_FORMAT_INTERVAL_YEAR "YYYY-MM"
-#define A_FORMAT_INTERVAL_DAY "DD HH:MI:SS"
+#define A_FORMAT_INTERVAL_DAY "DD HH24:MI:SS"
 #define POSITIVE_FORMAT(fmt) ("+" fmt)
 #define NEGETIVE_FORMAT(fmt) ("-" fmt)
 
diff --git a/src/test/regress/expected/hw_functions.out b/src/test/regress/expected/hw_functions.out
index e45916a16..bd5f7ebc6 100644
--- a/src/test/regress/expected/hw_functions.out
+++ b/src/test/regress/expected/hw_functions.out
@@ -838,6 +838,24 @@ SELECT TO_CHAR(INTERVAL '1 -11:11:11' DAY TO SECOND, 'YYYY-MON-DD');
  +01 11:11:11
 (1 row)
 
+SELECT TO_CHAR(INTERVAL '1 15h 24m 52s' DAY TO SECOND, 'YYYY-MON-DD');
+   to_char    
+--------------
+ +01 15:24:52
+(1 row)
+
+select to_char(interval '15h 24m 52s', 'HH24:MI:SS');
+   to_char    
+--------------
+ +00 15:24:52
+(1 row)
+
+SELECT TO_CHAR(INTERVAL '-15h 24m 52s' DAY TO SECOND, 'YYYY-MON-DD');
+   to_char    
+--------------
+ -00 15:24:52
+(1 row)
+
 SELECT TO_CHAR(INTERVAL '-11:11:11' DAY TO SECOND, 'YYYY-MON-DD');
    to_char    
 --------------
diff --git a/src/test/regress/sql/hw_functions.sql b/src/test/regress/sql/hw_functions.sql
index 7bc6ad93a..da832ba98 100644
--- a/src/test/regress/sql/hw_functions.sql
+++ b/src/test/regress/sql/hw_functions.sql
@@ -338,6 +338,9 @@ SELECT TO_CHAR(INTERVAL '123-2' YEAR(4) TO MONTH, 'YYY-MON', 'NLS_DATE_LANGUAGE
 SELECT TO_CHAR(INTERVAL '-1-2' YEAR TO MONTH, 'YYY-MON');
 SELECT TO_CHAR(INTERVAL '1 11:11:11' DAY TO SECOND, 'YYYY-MON-DD');
 SELECT TO_CHAR(INTERVAL '1 -11:11:11' DAY TO SECOND, 'YYYY-MON-DD');
+SELECT TO_CHAR(INTERVAL '1 15h 24m 52s' DAY TO SECOND, 'YYYY-MON-DD');
+select to_char(interval '15h 24m 52s', 'HH24:MI:SS');
+SELECT TO_CHAR(INTERVAL '-15h 24m 52s' DAY TO SECOND, 'YYYY-MON-DD');
 SELECT TO_CHAR(INTERVAL '-11:11:11' DAY TO SECOND, 'YYYY-MON-DD');
 SELECT TO_CHAR(INTERVAL '-1-2' YEAR TO MONTH, 'YYYY-MON-DD', '') ;
 SELECT TO_CHAR(INTERVAL '-1-2' YEAR TO MONTH, '', 'NLS_DATE_LANGUAGE=ENGLISH') ;