diff --git a/fe/fe-core/src/main/java/org/apache/doris/rewrite/FEFunctions.java b/fe/fe-core/src/main/java/org/apache/doris/rewrite/FEFunctions.java
index d67c55c183..03150ba1f2 100755
--- a/fe/fe-core/src/main/java/org/apache/doris/rewrite/FEFunctions.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/rewrite/FEFunctions.java
@@ -317,6 +317,14 @@ public class FEFunctions {
         return null;
     }
 
+    @FEFunction(name = "timestamp", argTypes = {"DATETIME"}, returnType = "DATETIME")
+    public static DateLiteral timestamp(LiteralExpr arg) throws AnalysisException {
+        if (arg instanceof DateLiteral) {
+            return (DateLiteral) arg;
+        }
+        return null;
+    }
+
     /**
      ------------------------------------------------------------------------------
      */
diff --git a/fe/fe-core/src/test/java/org/apache/doris/planner/ConstantExpressTest.java b/fe/fe-core/src/test/java/org/apache/doris/planner/ConstantExpressTest.java
index 4bcaea3ab6..5e30942724 100644
--- a/fe/fe-core/src/test/java/org/apache/doris/planner/ConstantExpressTest.java
+++ b/fe/fe-core/src/test/java/org/apache/doris/planner/ConstantExpressTest.java
@@ -225,4 +225,10 @@ public class ConstantExpressTest {
         explainString = UtFrameUtils.getSQLPlanOrErrorMsg(connectContext, "explain " + sql);
         Assert.assertTrue(explainString.contains("NULL"));
     }
+
+    @Test
+    public void testTimestamp() throws Exception {
+        testConstantExpressResult("select timestamp('2021-07-24 00:00:00')",
+            "'2021-07-24 00:00:00'");
+    }
 }