diff --git a/core/src/main/java/org/opensearch/sql/data/type/ExprCoreType.java b/core/src/main/java/org/opensearch/sql/data/type/ExprCoreType.java
index a674f668bf..a9ceeac4dc 100644
--- a/core/src/main/java/org/opensearch/sql/data/type/ExprCoreType.java
+++ b/core/src/main/java/org/opensearch/sql/data/type/ExprCoreType.java
@@ -57,7 +57,7 @@ public enum ExprCoreType implements ExprType {
   DATE(STRING),
   TIME(STRING),
   DATETIME(STRING, DATE, TIME),
-  TIMESTAMP(STRING, DATE, TIME, DATETIME),
+  TIMESTAMP(STRING, DATETIME),
   INTERVAL(UNDEFINED),
 
   /**
diff --git a/core/src/test/java/org/opensearch/sql/expression/function/WideningTypeRuleTest.java b/core/src/test/java/org/opensearch/sql/expression/function/WideningTypeRuleTest.java
index 1d8f4b725d..27b36a0fec 100644
--- a/core/src/test/java/org/opensearch/sql/expression/function/WideningTypeRuleTest.java
+++ b/core/src/test/java/org/opensearch/sql/expression/function/WideningTypeRuleTest.java
@@ -63,8 +63,8 @@ class WideningTypeRuleTest {
           .put(STRING, DATETIME, 1)
           .put(DATE, DATETIME, 1)
           .put(TIME, DATETIME, 1)
-          .put(DATE, TIMESTAMP, 1)
-          .put(TIME, TIMESTAMP, 1)
+          .put(DATE, TIMESTAMP, 2)
+          .put(TIME, TIMESTAMP, 2)
           .put(DATETIME, TIMESTAMP, 1)
           .put(UNDEFINED, BYTE, 1)
           .put(UNDEFINED, SHORT, 2)