tustvold commented on issue #5976:
URL:
https://github.com/apache/arrow-datafusion/issues/5976#issuecomment-1615207802
I think there are two related issues:
* The output always lacks a timezone
* The truncation should occur in the timestamp's timezone
```
❯ set timezone to '+08:00';
0 rows in set. Query took 0.001 seconds.
❯ select timestamptz '2000-01-01T00:00:00';
+-----------------------------+
| Utf8("2000-01-01T00:00:00") |
+-----------------------------+
| 2000-01-01T00:00:00+08:00 |
+-----------------------------+
❯ select date_trunc('day', timestamptz '2000-01-01T00:00:00');
+-----------------------------------------------------+
| date_trunc(Utf8("day"),Utf8("2000-01-01T00:00:00")) |
+-----------------------------------------------------+
| 1999-12-31T00:00:00 |
+-----------------------------------------------------+
1 row in set. Query took 0.002 seconds.
```
The output in the final case should be `2000-01-01T00:00:00+08:00`
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