BUG: is_normalized returned False for local tz

[ravinimmi]

• closes Test case failing - test_timezones.py:TestTimeZones.test_normalize_tz #13459
• tests added / passed
• passes git diff upstream/master | flake8 --diff
• whatsnew entry

is_normalized returned False for normalized date_range
in case of local timezone 'Asia/Kolkata'
Fixes: #13459

[codecov-io]

Current coverage is 84.33%

Merging #13484 into master will decrease coverage by <.01%

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[jreback]

do this in a loop for several timezones (e.g. Asia/Kolka, US/Eastern, UTC)

[sinhrks]

From user's point of view, it should describe the change related to DatetimeIndex.is_normalized. Also, it affects to all tz (not only to Kolkata).

[ravinimmi]

@jreback Please review.

[jreback]

add a doc-string with Parameters here (it must also be a string, so you should str(tz) somewhere.

[jreback]

looks good. just a few doc comments. ping when green.

[jreback]

((pandas3.5)) C:\Users\conda\Documents\pandas3.5>nosetests pandas\tseries\tests\test_timezones.py
............................................................S.......................................................................E.....

======================================================================
ERROR: test_normalize_tz_local (pandas.tseries.tests.test_timezones.TestTimeZones)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Users\conda\Documents\pandas3.5\pandas\tseries\tests\test_timezones.py", line 1409, in test_normalize_tz_local
    with set_timezone(timezone):
  File "C:\Miniconda2\envs\pandas3.5\lib\contextlib.py", line 59, in __enter__
    return next(self.gen)
  File "C:\Users\conda\Documents\pandas3.5\pandas\util\testing.py", line 2688, in set_timezone
    setTZ(tz)
  File "C:\Users\conda\Documents\pandas3.5\pandas\util\testing.py", line 2685, in setTZ
    time.tzset()
AttributeError: module 'time' has no attribute 'tzset'

----------------------------------------------------------------------
Ran 140 tests in 1.374s

FAILED (SKIP=1, errors=1)

so appears time.tzset() doesn't exist on windows (or maybe is called something else). If you can figure this out would be great.

If you can then we need to do a platform check inside the context manager and raise a Skiptest (though maybe just have the context manager raise something helpful and let the test writer worry about the skip)

[ravinimmi]

@jreback Its green. How does it look now?

[jreback]

thanks!