jorisvandenbossche commented on issue #39809:
URL: https://github.com/apache/arrow/issues/39809#issuecomment-1916309229
We actually also raise an error if you try to _use_ the lower case "utc",
exactly for that reason of not being part of the database. For example:
```
In [18]: arr_naive = pa.array([pd.Timestamp("2021-01-01 09:00")])
In [19]: pc.assume_timezone(arr_naive, "utc")
...
ArrowInvalid: Cannot locate timezone 'utc': utc not found in timezone
database
```
However, the issue here is that we don't do any validation of the timezone
at all at construction time of the type (or when reading in a file, or ..). At
the moment you can perfectly write complete nonsense like `pa.timestamp("us",
tz="blabla")`.
I assume one reason for this is because there is not necessarily a guarantee
that a timezone database is available to perform this check (i.e. typically on
windows).
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