datediff() gives wrong output when run in a tez task with some non-UTC timezone

create external table test_dt(id string, dt date);
insert into test_dt values('11', '2021-07-06'), ('22', '2021-07-07');

select datediff(dt1.dt, '2021-07-01') from test_dt dt1 left join test_dt dt on dt1.id = dt.id;
+------+
| _c0  |
+------+
| 6    |
| 7    |
+------+

+------+
| _c0  |
+------+
| 5    |
| 6    |
+------+

-          date.setTime(formatter.parse(new String(bytesValue, "UTF-8")).getTime());
-          baseDate = DateWritableV2.dateToDays(date);
+          org.apache.hadoop.hive.common.type.Date hiveDate
+              = org.apache.hadoop.hive.common.type.Date.valueOf(new String(bytesValue, "UTF-8"));
+          date.setTime(hiveDate.toEpochMilli());
+          baseDate = hiveDate.toEpochDay();