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pandas.Series.dt.tz

Series.dt. tz

Return the timezone.

Returns
datetime.tzinfo, pytz.tzinfo.BaseTZInfo, dateutil.tz.tz.tzfile, or None

Returns None when the array is tz-naive.

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https://pandas.pydata.org/pandas-docs/version/1.4.0/reference/api/pandas.Series.dt.tz.html