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BUG: guess_datetime_format doesn't guess format correctly for UTC+1 #48954

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Merged
mroeschke merged 2 commits into from
Oct 5, 2022
Merged

BUG: guess_datetime_format doesn't guess format correctly for UTC+1 #48954

mroeschke merged 2 commits into from
Oct 5, 2022

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@MarcoGorelli
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@MarcoGorelli MarcoGorelli commented Oct 5, 2022 •
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Haven't added a whatsnew note as this function isn't (yet) user-facing

This extra try-except adds about 9 microseconds on my laptop:

upstream/main:

In [2]: %%timeit
   ...: guess_datetime_format('2020-01-01 00:00:00 UTC+1')
   ...: 
   ...: 
93 µs ± 652 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each)

this branch:

In [3]: %%timeit
   ...: guess_datetime_format('2020-01-01 00:00:00 UTC+1')
   ...: 
   ...: 
102 µs ± 141 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each)

IMO this is negligible and worth it

@MarcoGorelli MarcoGorelli added Bug Datetime Datetime data dtype labels Oct 5, 2022
@MarcoGorelli MarcoGorelli requested a review from mroeschke October 5, 2022 18:10
mroeschke
mroeschke reviewed Oct 5, 2022
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pandas/tests/tslibs/test_parsing.py
("2011-12-30T00:00:00.000000+09:000", "%Y-%m-%dT%H:%M:%S.%f%z"),
("2011-12-30T00:00:00.000000+9:0", "%Y-%m-%dT%H:%M:%S.%f%z"),
("2011-12-30T00:00:00.000000+09:000", None),
("2011-12-30T00:00:00.000000+9:0", None),
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Could you add a comment in the test to note that odd +9 format shouldn't be supported by %z but dateutil.parse can support this format?

mroeschke
mroeschke reviewed Oct 5, 2022
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Just a comment to add a comment otherwise LGTM

@mroeschke mroeschke added this to the 1.6 milestone Oct 5, 2022
@mroeschke mroeschke merged commit f47d82b into pandas-dev:main Oct 5, 2022
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mroeschke commented Oct 5, 2022

Thanks @MarcoGorelli

@mroeschke mroeschke modified the milestones: 1.6, 2.0 Oct 13, 2022
noatamir pushed a commit to noatamir/pandas that referenced this pull request Nov 9, 2022
@MarcoGorelli @noatamir
BUG: guess_datetime_format doesn't guess format correctly for UTC+1 (p…
b7e4c11 
…andas-dev#48954)

* BUG: guess_datetime_format doesn't guess format correctly for UTC+1

* :doc: add comment on +9 offset

Co-authored-by: MarcoGorelli <>
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BUG: guess_datetime_format doesn't guess format correctly for UTC+1

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