waitingkuo commented on issue #765:
URL: 
https://github.com/apache/arrow-datafusion/issues/765#issuecomment-1263648603

   @alamb i think `to_timestamp` automatically append your local time zone if 
there's no timezone in your time string, and convert it back to utc (note that 
the underline value doesn't change), and then drop the timezone
   
   i'm in utc+8, here's what i have
   ```bash
   ❯ select to_timestamp('2021-07-20 23:29:30');
   +------------------------------------------+
   | totimestamp(Utf8("2021-07-20 23:29:30")) |
   +------------------------------------------+
   | 2021-07-20 15:29:30                      |
   +------------------------------------------+
   1 row in set. Query took 0.001 seconds.
   ```
   
   I assume that you are in negative time zone so that the result timestamp is 
larger 
   


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