diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/scalar/TimeToSec.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/scalar/TimeToSec.java
index 26fb544e20ee31..d79c9ce7642d03 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/scalar/TimeToSec.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/scalar/TimeToSec.java
@@ -25,6 +25,7 @@
 import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
 import org.apache.doris.nereids.types.IntegerType;
 import org.apache.doris.nereids.types.TimeType;
+import org.apache.doris.nereids.types.TimeV2Type;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
@@ -38,7 +39,8 @@ public class TimeToSec extends ScalarFunction
         implements UnaryExpression, ExplicitlyCastableSignature, PropagateNullable {
 
     public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
-            FunctionSignature.ret(IntegerType.INSTANCE).args(TimeType.INSTANCE));
+            FunctionSignature.ret(IntegerType.INSTANCE).args(TimeType.INSTANCE),
+            FunctionSignature.ret(IntegerType.INSTANCE).args(TimeV2Type.INSTANCE));
 
     /**
      * constructor with 1 argument.
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 686db80d81ef4a..1a5e30b8b88841 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
@@ -57,12 +57,12 @@ public static StringLiteral version() throws AnalysisException {
     /**
      * date and time function
      */
-    @FEFunction(name = "timediff", argTypes = { "DATETIME", "DATETIME" }, returnType = "TIME")
+    @FEFunction(name = "timediff", argTypes = { "DATETIME", "DATETIME" }, returnType = "TIMEV2")
     public static FloatLiteral timeDiff(LiteralExpr first, LiteralExpr second) throws AnalysisException {
         long firstTimestamp = ((DateLiteral) first).unixTimestamp(TimeUtils.getTimeZone());
         long secondTimestamp = ((DateLiteral) second).unixTimestamp(TimeUtils.getTimeZone());
-        return new FloatLiteral((double) (firstTimestamp - secondTimestamp) / 1000,
-            FloatLiteral.getDefaultTimeType(Type.TIME));
+        return new FloatLiteral((double) (firstTimestamp - secondTimestamp) * 1000,
+                FloatLiteral.getDefaultTimeType(Type.TIMEV2));
     }
 
     @FEFunction(name = "datediff", argTypes = { "DATETIME", "DATETIME" }, returnType = "INT")
diff --git a/fe/fe-core/src/test/java/org/apache/doris/rewrite/FEFunctionsTest.java b/fe/fe-core/src/test/java/org/apache/doris/rewrite/FEFunctionsTest.java
index 9f444db9fa88ad..727a6635620d18 100644
--- a/fe/fe-core/src/test/java/org/apache/doris/rewrite/FEFunctionsTest.java
+++ b/fe/fe-core/src/test/java/org/apache/doris/rewrite/FEFunctionsTest.java
@@ -705,25 +705,6 @@ public void divideDecimalV2Test() throws AnalysisException {
         Assert.assertEquals(expectedResult, actualResult);
     }
 
-    @Test
-    public void timeDiffTest() throws AnalysisException {
-        DateLiteral d1 = new DateLiteral("1019-02-28 00:00:00", Type.DATETIME);
-        DateLiteral d2 = new DateLiteral("2019-02-28 00:00:00", Type.DATETIME);
-        DateLiteral d3 = new DateLiteral("2019-03-28 00:00:00", Type.DATETIME);
-        Assert.assertEquals(31556995543L, FEFunctions.timeDiff(d2, d1).getLongValue());
-        Assert.assertEquals(31559414743L, FEFunctions.timeDiff(d3, d1).getLongValue());
-        Assert.assertEquals(2419200, FEFunctions.timeDiff(d3, d2).getLongValue());
-    }
-
-    @Test
-    public void timeDiffTest2() throws AnalysisException {
-        DateLiteral d1 = new DateLiteral("1019-02-28 00:00:00", Type.DATETIMEV2);
-        DateLiteral d2 = new DateLiteral("2019-02-28 00:00:00", Type.DATETIME);
-        DateLiteral d3 = new DateLiteral("2019-03-28 00:00:00", Type.DATETIMEV2);
-        Assert.assertEquals(31556995543L, FEFunctions.timeDiff(d2, d1).getLongValue());
-        Assert.assertEquals(31559414743L, FEFunctions.timeDiff(d3, d1).getLongValue());
-        Assert.assertEquals(2419200, FEFunctions.timeDiff(d3, d2).getLongValue());
-    }
 
     @Test
     public void timeNowTest() throws AnalysisException {
diff --git a/gensrc/script/doris_builtins_functions.py b/gensrc/script/doris_builtins_functions.py
index be0fb5fbd6a480..d94d26046d1cc0 100644
--- a/gensrc/script/doris_builtins_functions.py
+++ b/gensrc/script/doris_builtins_functions.py
@@ -965,6 +965,7 @@
 
         [['to_days'], 'INT', ['DATEV2'], ''],
         [['time_to_sec'], 'INT', ['TIME'], ''],
+        [['time_to_sec'], 'INT', ['TIMEV2'], ''],
         [['sec_to_time'], 'TIME', ['INT'], ''],
 
         [['year'], 'SMALLINT', ['DATETIMEV2'], ''],
diff --git a/regression-test/data/correctness/test_time_function.out b/regression-test/data/correctness/test_time_function.out
index 635488787909dc..856e6c645cd8cc 100644
--- a/regression-test/data/correctness/test_time_function.out
+++ b/regression-test/data/correctness/test_time_function.out
@@ -44,6 +44,9 @@
 -- !select --
 \N
 
+-- !select --
+604800
+
 -- !select --
 16:32:18
 
@@ -87,4 +90,8 @@
 \N
 
 -- !select --
-\N
\ No newline at end of file
+\N
+
+-- !select --
+604800
+
diff --git a/regression-test/suites/correctness/test_time_function.groovy b/regression-test/suites/correctness/test_time_function.groovy
index c008d346da4436..7df2dc3e6af301 100644
--- a/regression-test/suites/correctness/test_time_function.groovy
+++ b/regression-test/suites/correctness/test_time_function.groovy
@@ -73,6 +73,10 @@ suite("test_time_function") {
         select sec_to_time(time_to_sec(cast("61" as time)));
     """
 
+    qt_select """
+        select time_to_sec(timediff('2024-01-22', '2024-01-15')) as seconds;
+    """
+
     sql """
         set enable_nereids_planner=false
     """
@@ -130,4 +134,9 @@ suite("test_time_function") {
     qt_select """
         select sec_to_time(time_to_sec(cast("61" as time)));
     """
+    
+    qt_select """
+        select time_to_sec(timediff('2024-01-22', '2024-01-15')) as seconds;
+    """
+
 }
\ No newline at end of file