diff --git a/datafusion/core/tests/sql/timestamp.rs b/datafusion/core/tests/sql/timestamp.rs
index 8e293d035f6f..30d823547261 100644
--- a/datafusion/core/tests/sql/timestamp.rs
+++ b/datafusion/core/tests/sql/timestamp.rs
@@ -1065,3 +1065,83 @@ async fn cast_to_timestamp_micros_twice() -> Result<()> {
 
     Ok(())
 }
+
+#[tokio::test]
+async fn to_timestamp_i32() -> Result<()> {
+    let ctx = SessionContext::new();
+
+    let sql = "select to_timestamp(cast (1 as int));";
+    let results = execute_to_batches(&ctx, sql).await;
+
+    let expected = vec![
+        "+--------------------------------------+",
+        "| totimestamp(CAST(Int64(1) AS Int32)) |",
+        "+--------------------------------------+",
+        "| 1970-01-01 00:00:00.000000001        |",
+        "+--------------------------------------+",
+    ];
+
+    assert_batches_eq!(expected, &results);
+
+    Ok(())
+}
+
+#[tokio::test]
+async fn to_timestamp_micros_i32() -> Result<()> {
+    let ctx = SessionContext::new();
+
+    let sql = "select to_timestamp_micros(cast (1 as int));";
+    let results = execute_to_batches(&ctx, sql).await;
+
+    let expected = vec![
+        "+--------------------------------------------+",
+        "| totimestampmicros(CAST(Int64(1) AS Int32)) |",
+        "+--------------------------------------------+",
+        "| 1970-01-01 00:00:00.000001                 |",
+        "+--------------------------------------------+",
+    ];
+
+    assert_batches_eq!(expected, &results);
+
+    Ok(())
+}
+
+#[tokio::test]
+async fn to_timestamp_millis_i32() -> Result<()> {
+    let ctx = SessionContext::new();
+
+    let sql = "select to_timestamp_millis(cast (1 as int));";
+    let results = execute_to_batches(&ctx, sql).await;
+
+    let expected = vec![
+        "+--------------------------------------------+",
+        "| totimestampmillis(CAST(Int64(1) AS Int32)) |",
+        "+--------------------------------------------+",
+        "| 1970-01-01 00:00:00.001                    |",
+        "+--------------------------------------------+",
+    ];
+
+    assert_batches_eq!(expected, &results);
+
+    Ok(())
+}
+
+#[tokio::test]
+async fn to_timestamp_seconds_i32() -> Result<()> {
+    let ctx = SessionContext::new();
+
+    let sql = "select to_timestamp_seconds(cast (1 as int));";
+    let results = execute_to_batches(&ctx, sql).await;
+
+    let expected = vec![
+        "+---------------------------------------------+",
+        "| totimestampseconds(CAST(Int64(1) AS Int32)) |",
+        "+---------------------------------------------+",
+        "| 1970-01-01 00:00:01                         |",
+        "+---------------------------------------------+",
+    ];
+
+    assert_batches_eq!(expected, &results);
+
+    Ok(())
+}
diff --git a/datafusion/expr/src/function.rs b/datafusion/expr/src/function.rs
index 45cd99d5703e..7b66f97529f2 100644
--- a/datafusion/expr/src/function.rs
+++ b/datafusion/expr/src/function.rs
@@ -348,48 +348,48 @@ pub fn signature(fun: &BuiltinScalarFunction) -> Signature {
         BuiltinScalarFunction::ToTimestamp => Signature::uniform(
             1,
             vec![
-                DataType::Utf8,
                 DataType::Int64,
                 DataType::Timestamp(TimeUnit::Nanosecond, None),
                 DataType::Timestamp(TimeUnit::Microsecond, None),
                 DataType::Timestamp(TimeUnit::Millisecond, None),
                 DataType::Timestamp(TimeUnit::Second, None),
+                DataType::Utf8,
             ],
             fun.volatility(),
         ),
         BuiltinScalarFunction::ToTimestampMillis => Signature::uniform(
             1,
             vec![
-                DataType::Utf8,
                 DataType::Int64,
                 DataType::Timestamp(TimeUnit::Nanosecond, None),
                 DataType::Timestamp(TimeUnit::Microsecond, None),
                 DataType::Timestamp(TimeUnit::Millisecond, None),
                 DataType::Timestamp(TimeUnit::Second, None),
+                DataType::Utf8,
             ],
             fun.volatility(),
         ),
         BuiltinScalarFunction::ToTimestampMicros => Signature::uniform(
             1,
             vec![
-                DataType::Utf8,
                 DataType::Int64,
                 DataType::Timestamp(TimeUnit::Nanosecond, None),
                 DataType::Timestamp(TimeUnit::Microsecond, None),
                 DataType::Timestamp(TimeUnit::Millisecond, None),
                 DataType::Timestamp(TimeUnit::Second, None),
+                DataType::Utf8,
             ],
             fun.volatility(),
         ),
         BuiltinScalarFunction::ToTimestampSeconds => Signature::uniform(
             1,
             vec![
-                DataType::Utf8,
                 DataType::Int64,
                 DataType::Timestamp(TimeUnit::Nanosecond, None),
                 DataType::Timestamp(TimeUnit::Microsecond, None),
                 DataType::Timestamp(TimeUnit::Millisecond, None),
                 DataType::Timestamp(TimeUnit::Second, None),
+                DataType::Utf8,
             ],
             fun.volatility(),
         ),