add a case for Asia/Kathmandu

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

Author: waynexia

datafusion/functions/src/datetime/date_trunc.rs

@@ -946,6 +946,21 @@ mod tests {
                     "2018-11-04T02:00:00-02",
                 ],
             ),
+            (
+                vec![
+                    "2024-10-26T23:30:00Z",
+                    "2024-10-27T00:30:00Z",
+                    "2024-10-27T01:30:00Z",
+                    "2024-10-27T02:30:00Z",
+                ],
+                Some("Asia/Kathmandu".into()), // UTC+5:45
+                vec![
+                    "2024-10-27T05:00:00+05:45",
+                    "2024-10-27T06:00:00+05:45",
+                    "2024-10-27T07:00:00+05:45",
+                    "2024-10-27T08:00:00+05:45",
+                ],
+            ),
         ];
 
         cases.iter().for_each(|(original, tz_opt, expected)| {