BUG: AmbiguousTimeError when using date_range even when argument ambiguous is set (original) (raw)

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Code Sample, a copy-pastable example

import pandas as pd timezone = 'America/New_York' start = pd.Timestamp(year=2020, month=11, day=1, hour=1).tz_localize(timezone, ambiguous=False) pd.date_range(start, periods=2, ambiguous=False)

AmbiguousTimeError Traceback (most recent call last) in 2 timezone = 'America/New_York' 3 start = pd.Timestamp(year=2020, month=11, day=1, hour=1).tz_localize(timezone, ambiguous=False) ----> 4 pd.date_range(start, periods=2, ambiguous=False)

~/anaconda3/envs/oids_tst/lib/python3.6/site-packages/pandas/core/indexes/datetimes.py in date_range(start, end, periods, freq, tz, normalize, name, closed, **kwargs) 1178 normalize=normalize, 1179 closed=closed, -> 1180 **kwargs, 1181 ) 1182 return DatetimeIndex._simple_new(dtarr, tz=dtarr.tz, freq=dtarr.freq, name=name)

~/anaconda3/envs/oids_tst/lib/python3.6/site-packages/pandas/core/arrays/datetimes.py in _generate_range(cls, start, end, periods, freq, tz, normalize, ambiguous, nonexistent, closed) 419 # start/end as well to compare 420 if start is not None: --> 421 start = start.tz_localize(tz).asm8 422 if end is not None: 423 end = end.tz_localize(tz).asm8

pandas/_libs/tslibs/timestamps.pyx in pandas._libs.tslibs.timestamps.Timestamp.tz_localize()

pandas/_libs/tslibs/tzconversion.pyx in pandas._libs.tslibs.tzconversion.tz_localize_to_utc()

AmbiguousTimeError: Cannot infer dst time from 2020-11-01 01:00:00, try using the 'ambiguous' argument

Problem description

When the start time is at the day light saving ambiguous time, date_range raises errors even when the argument 'ambiguous' is set. It should not be raising error when the argument is set.

Issue could be due to the line

start = start.tz_localize(tz).asm8

does not correctly pass the argument ambiguous to the function tz_localize().

Expected Output

No error