diff --git a/fe/fe-core/src/main/java/com/starrocks/sql/optimizer/rewrite/ScalarOperatorFunctions.java b/fe/fe-core/src/main/java/com/starrocks/sql/optimizer/rewrite/ScalarOperatorFunctions.java
index 72296be6eabda..02a60eb32ce12 100644
--- a/fe/fe-core/src/main/java/com/starrocks/sql/optimizer/rewrite/ScalarOperatorFunctions.java
+++ b/fe/fe-core/src/main/java/com/starrocks/sql/optimizer/rewrite/ScalarOperatorFunctions.java
@@ -232,6 +232,17 @@ public static ConstantOperator dateDiff(ConstantOperator first, ConstantOperator
                 first.getDatetime().truncatedTo(ChronoUnit.DAYS)).toDays());
     }
 
+    @ConstantFunction.List(list = {
+            @ConstantFunction(name = "to_days", argTypes = {DATETIME}, returnType = INT, isMonotonic = true),
+            @ConstantFunction(name = "to_days", argTypes = {DATE}, returnType = INT, isMonotonic = true)
+    })
+    public static ConstantOperator to_days(ConstantOperator first) {
+        ConstantOperator second = ConstantOperator.createDatetime(LocalDateTime.of(0000, 01, 01, 00, 00, 00));
+        return ConstantOperator.createInt((int) Duration.between(
+                second.getDatetime().truncatedTo(ChronoUnit.DAYS),
+                first.getDatetime().truncatedTo(ChronoUnit.DAYS)).toDays());
+    }
+
     @ConstantFunction.List(list = {
             @ConstantFunction(name = "years_add", argTypes = {DATETIME,
                     INT}, returnType = DATETIME, isMonotonic = true),
diff --git a/fe/fe-core/src/test/java/com/starrocks/sql/optimizer/rewrite/ScalarOperatorFunctionsTest.java b/fe/fe-core/src/test/java/com/starrocks/sql/optimizer/rewrite/ScalarOperatorFunctionsTest.java
index 6f9eb1da46624..c2b47037745a1 100644
--- a/fe/fe-core/src/test/java/com/starrocks/sql/optimizer/rewrite/ScalarOperatorFunctionsTest.java
+++ b/fe/fe-core/src/test/java/com/starrocks/sql/optimizer/rewrite/ScalarOperatorFunctionsTest.java
@@ -125,6 +125,11 @@ public void dateDiff() {
         assertEquals(-1572, ScalarOperatorFunctions.dateDiff(O_DT_20101202_023010, O_DT_20150323_092355).getInt());
     }
 
+    @Test
+    public void to_days() {
+        assertEquals(734443, ScalarOperatorFunctions.to_days(O_DT_20101102_183010).getInt());
+    }
+
     @Test
     public void yearsAdd() {
         assertEquals("2025-03-23T09:23:55",