456 lines
16 KiB
Python
456 lines
16 KiB
Python
"""
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Tests for Timestamp timezone-related methods
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"""
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from datetime import (
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date,
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datetime,
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timedelta,
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)
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import dateutil
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from dateutil.tz import (
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gettz,
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tzoffset,
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)
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import pytest
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import pytz
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from pytz.exceptions import (
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AmbiguousTimeError,
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NonExistentTimeError,
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)
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from pandas._libs.tslibs import timezones
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from pandas.errors import OutOfBoundsDatetime
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import pandas.util._test_decorators as td
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from pandas import (
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NaT,
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Timestamp,
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)
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class TestTimestampTZOperations:
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# --------------------------------------------------------------
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# Timestamp.tz_localize
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def test_tz_localize_pushes_out_of_bounds(self):
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# GH#12677
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# tz_localize that pushes away from the boundary is OK
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msg = (
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f"Converting {Timestamp.min.strftime('%Y-%m-%d %H:%M:%S')} "
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f"underflows past {Timestamp.min}"
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)
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pac = Timestamp.min.tz_localize("US/Pacific")
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assert pac.value > Timestamp.min.value
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pac.tz_convert("Asia/Tokyo") # tz_convert doesn't change value
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with pytest.raises(OutOfBoundsDatetime, match=msg):
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Timestamp.min.tz_localize("Asia/Tokyo")
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# tz_localize that pushes away from the boundary is OK
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msg = (
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f"Converting {Timestamp.max.strftime('%Y-%m-%d %H:%M:%S')} "
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f"overflows past {Timestamp.max}"
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)
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tokyo = Timestamp.max.tz_localize("Asia/Tokyo")
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assert tokyo.value < Timestamp.max.value
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tokyo.tz_convert("US/Pacific") # tz_convert doesn't change value
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with pytest.raises(OutOfBoundsDatetime, match=msg):
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Timestamp.max.tz_localize("US/Pacific")
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def test_tz_localize_ambiguous_bool(self):
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# make sure that we are correctly accepting bool values as ambiguous
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# GH#14402
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ts = Timestamp("2015-11-01 01:00:03")
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expected0 = Timestamp("2015-11-01 01:00:03-0500", tz="US/Central")
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expected1 = Timestamp("2015-11-01 01:00:03-0600", tz="US/Central")
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msg = "Cannot infer dst time from 2015-11-01 01:00:03"
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with pytest.raises(pytz.AmbiguousTimeError, match=msg):
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ts.tz_localize("US/Central")
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result = ts.tz_localize("US/Central", ambiguous=True)
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assert result == expected0
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result = ts.tz_localize("US/Central", ambiguous=False)
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assert result == expected1
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def test_tz_localize_ambiguous(self):
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ts = Timestamp("2014-11-02 01:00")
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ts_dst = ts.tz_localize("US/Eastern", ambiguous=True)
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ts_no_dst = ts.tz_localize("US/Eastern", ambiguous=False)
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assert (ts_no_dst.value - ts_dst.value) / 1e9 == 3600
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msg = "Cannot infer offset with only one time"
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with pytest.raises(ValueError, match=msg):
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ts.tz_localize("US/Eastern", ambiguous="infer")
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# GH#8025
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msg = "Cannot localize tz-aware Timestamp, use tz_convert for conversions"
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with pytest.raises(TypeError, match=msg):
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Timestamp("2011-01-01", tz="US/Eastern").tz_localize("Asia/Tokyo")
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msg = "Cannot convert tz-naive Timestamp, use tz_localize to localize"
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with pytest.raises(TypeError, match=msg):
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Timestamp("2011-01-01").tz_convert("Asia/Tokyo")
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@pytest.mark.parametrize(
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"stamp, tz",
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[
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("2015-03-08 02:00", "US/Eastern"),
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("2015-03-08 02:30", "US/Pacific"),
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("2015-03-29 02:00", "Europe/Paris"),
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("2015-03-29 02:30", "Europe/Belgrade"),
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],
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)
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def test_tz_localize_nonexistent(self, stamp, tz):
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# GH#13057
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ts = Timestamp(stamp)
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with pytest.raises(NonExistentTimeError, match=stamp):
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ts.tz_localize(tz)
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# GH 22644
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with pytest.raises(NonExistentTimeError, match=stamp):
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ts.tz_localize(tz, nonexistent="raise")
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assert ts.tz_localize(tz, nonexistent="NaT") is NaT
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def test_tz_localize_ambiguous_raise(self):
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# GH#13057
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ts = Timestamp("2015-11-1 01:00")
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msg = "Cannot infer dst time from 2015-11-01 01:00:00,"
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with pytest.raises(AmbiguousTimeError, match=msg):
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ts.tz_localize("US/Pacific", ambiguous="raise")
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def test_tz_localize_nonexistent_invalid_arg(self):
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# GH 22644
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tz = "Europe/Warsaw"
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ts = Timestamp("2015-03-29 02:00:00")
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msg = (
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"The nonexistent argument must be one of 'raise', 'NaT', "
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"'shift_forward', 'shift_backward' or a timedelta object"
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)
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with pytest.raises(ValueError, match=msg):
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ts.tz_localize(tz, nonexistent="foo")
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@pytest.mark.parametrize(
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"stamp",
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[
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"2014-02-01 09:00",
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"2014-07-08 09:00",
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"2014-11-01 17:00",
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"2014-11-05 00:00",
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],
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)
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def test_tz_localize_roundtrip(self, stamp, tz_aware_fixture):
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tz = tz_aware_fixture
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ts = Timestamp(stamp)
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localized = ts.tz_localize(tz)
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assert localized == Timestamp(stamp, tz=tz)
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msg = "Cannot localize tz-aware Timestamp"
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with pytest.raises(TypeError, match=msg):
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localized.tz_localize(tz)
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reset = localized.tz_localize(None)
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assert reset == ts
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assert reset.tzinfo is None
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def test_tz_localize_ambiguous_compat(self):
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# validate that pytz and dateutil are compat for dst
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# when the transition happens
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naive = Timestamp("2013-10-27 01:00:00")
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pytz_zone = "Europe/London"
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dateutil_zone = "dateutil/Europe/London"
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result_pytz = naive.tz_localize(pytz_zone, ambiguous=0)
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result_dateutil = naive.tz_localize(dateutil_zone, ambiguous=0)
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assert result_pytz.value == result_dateutil.value
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assert result_pytz.value == 1382835600000000000
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# fixed ambiguous behavior
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# see gh-14621, GH#45087
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assert result_pytz.to_pydatetime().tzname() == "GMT"
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assert result_dateutil.to_pydatetime().tzname() == "GMT"
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assert str(result_pytz) == str(result_dateutil)
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# 1 hour difference
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result_pytz = naive.tz_localize(pytz_zone, ambiguous=1)
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result_dateutil = naive.tz_localize(dateutil_zone, ambiguous=1)
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assert result_pytz.value == result_dateutil.value
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assert result_pytz.value == 1382832000000000000
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# see gh-14621
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assert str(result_pytz) == str(result_dateutil)
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assert (
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result_pytz.to_pydatetime().tzname()
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== result_dateutil.to_pydatetime().tzname()
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)
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@pytest.mark.parametrize(
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"tz",
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[
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pytz.timezone("US/Eastern"),
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gettz("US/Eastern"),
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"US/Eastern",
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"dateutil/US/Eastern",
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],
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)
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def test_timestamp_tz_localize(self, tz):
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stamp = Timestamp("3/11/2012 04:00")
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result = stamp.tz_localize(tz)
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expected = Timestamp("3/11/2012 04:00", tz=tz)
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assert result.hour == expected.hour
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assert result == expected
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@pytest.mark.parametrize(
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"start_ts, tz, end_ts, shift",
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[
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["2015-03-29 02:20:00", "Europe/Warsaw", "2015-03-29 03:00:00", "forward"],
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[
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"2015-03-29 02:20:00",
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"Europe/Warsaw",
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"2015-03-29 01:59:59.999999999",
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"backward",
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],
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[
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"2015-03-29 02:20:00",
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"Europe/Warsaw",
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"2015-03-29 03:20:00",
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timedelta(hours=1),
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],
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[
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"2015-03-29 02:20:00",
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"Europe/Warsaw",
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"2015-03-29 01:20:00",
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timedelta(hours=-1),
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],
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["2018-03-11 02:33:00", "US/Pacific", "2018-03-11 03:00:00", "forward"],
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[
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"2018-03-11 02:33:00",
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"US/Pacific",
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"2018-03-11 01:59:59.999999999",
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"backward",
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],
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[
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"2018-03-11 02:33:00",
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"US/Pacific",
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"2018-03-11 03:33:00",
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timedelta(hours=1),
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],
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[
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"2018-03-11 02:33:00",
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"US/Pacific",
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"2018-03-11 01:33:00",
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timedelta(hours=-1),
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],
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],
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)
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@pytest.mark.parametrize("tz_type", ["", "dateutil/"])
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def test_timestamp_tz_localize_nonexistent_shift(
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self, start_ts, tz, end_ts, shift, tz_type
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):
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# GH 8917, 24466
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tz = tz_type + tz
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if isinstance(shift, str):
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shift = "shift_" + shift
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ts = Timestamp(start_ts)
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result = ts.tz_localize(tz, nonexistent=shift)
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expected = Timestamp(end_ts).tz_localize(tz)
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assert result == expected
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@pytest.mark.parametrize("offset", [-1, 1])
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@pytest.mark.parametrize("tz_type", ["", "dateutil/"])
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def test_timestamp_tz_localize_nonexistent_shift_invalid(self, offset, tz_type):
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# GH 8917, 24466
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tz = tz_type + "Europe/Warsaw"
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ts = Timestamp("2015-03-29 02:20:00")
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msg = "The provided timedelta will relocalize on a nonexistent time"
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with pytest.raises(ValueError, match=msg):
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ts.tz_localize(tz, nonexistent=timedelta(seconds=offset))
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@pytest.mark.parametrize("tz", ["Europe/Warsaw", "dateutil/Europe/Warsaw"])
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def test_timestamp_tz_localize_nonexistent_NaT(self, tz):
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# GH 8917
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ts = Timestamp("2015-03-29 02:20:00")
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result = ts.tz_localize(tz, nonexistent="NaT")
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assert result is NaT
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@pytest.mark.parametrize("tz", ["Europe/Warsaw", "dateutil/Europe/Warsaw"])
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def test_timestamp_tz_localize_nonexistent_raise(self, tz):
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# GH 8917
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ts = Timestamp("2015-03-29 02:20:00")
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msg = "2015-03-29 02:20:00"
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with pytest.raises(pytz.NonExistentTimeError, match=msg):
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ts.tz_localize(tz, nonexistent="raise")
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msg = (
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"The nonexistent argument must be one of 'raise', 'NaT', "
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"'shift_forward', 'shift_backward' or a timedelta object"
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)
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with pytest.raises(ValueError, match=msg):
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ts.tz_localize(tz, nonexistent="foo")
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# ------------------------------------------------------------------
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# Timestamp.tz_convert
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@pytest.mark.parametrize(
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"stamp",
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[
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"2014-02-01 09:00",
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"2014-07-08 09:00",
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"2014-11-01 17:00",
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"2014-11-05 00:00",
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],
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)
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def test_tz_convert_roundtrip(self, stamp, tz_aware_fixture):
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tz = tz_aware_fixture
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ts = Timestamp(stamp, tz="UTC")
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converted = ts.tz_convert(tz)
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reset = converted.tz_convert(None)
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assert reset == Timestamp(stamp)
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assert reset.tzinfo is None
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assert reset == converted.tz_convert("UTC").tz_localize(None)
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@pytest.mark.parametrize("tzstr", ["US/Eastern", "dateutil/US/Eastern"])
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def test_astimezone(self, tzstr):
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# astimezone is an alias for tz_convert, so keep it with
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# the tz_convert tests
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utcdate = Timestamp("3/11/2012 22:00", tz="UTC")
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expected = utcdate.tz_convert(tzstr)
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result = utcdate.astimezone(tzstr)
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assert expected == result
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assert isinstance(result, Timestamp)
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@td.skip_if_windows
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def test_tz_convert_utc_with_system_utc(self):
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# from system utc to real utc
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ts = Timestamp("2001-01-05 11:56", tz=timezones.maybe_get_tz("dateutil/UTC"))
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# check that the time hasn't changed.
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assert ts == ts.tz_convert(dateutil.tz.tzutc())
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# from system utc to real utc
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ts = Timestamp("2001-01-05 11:56", tz=timezones.maybe_get_tz("dateutil/UTC"))
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# check that the time hasn't changed.
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assert ts == ts.tz_convert(dateutil.tz.tzutc())
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# ------------------------------------------------------------------
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# Timestamp.__init__ with tz str or tzinfo
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def test_timestamp_constructor_tz_utc(self):
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utc_stamp = Timestamp("3/11/2012 05:00", tz="utc")
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assert utc_stamp.tzinfo is pytz.utc
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assert utc_stamp.hour == 5
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utc_stamp = Timestamp("3/11/2012 05:00").tz_localize("utc")
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assert utc_stamp.hour == 5
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def test_timestamp_to_datetime_tzoffset(self):
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tzinfo = tzoffset(None, 7200)
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expected = Timestamp("3/11/2012 04:00", tz=tzinfo)
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result = Timestamp(expected.to_pydatetime())
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assert expected == result
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def test_timestamp_constructor_near_dst_boundary(self):
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# GH#11481 & GH#15777
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# Naive string timestamps were being localized incorrectly
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# with tz_convert_from_utc_single instead of tz_localize_to_utc
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for tz in ["Europe/Brussels", "Europe/Prague"]:
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result = Timestamp("2015-10-25 01:00", tz=tz)
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expected = Timestamp("2015-10-25 01:00").tz_localize(tz)
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assert result == expected
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msg = "Cannot infer dst time from 2015-10-25 02:00:00"
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with pytest.raises(pytz.AmbiguousTimeError, match=msg):
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Timestamp("2015-10-25 02:00", tz=tz)
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result = Timestamp("2017-03-26 01:00", tz="Europe/Paris")
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expected = Timestamp("2017-03-26 01:00").tz_localize("Europe/Paris")
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assert result == expected
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msg = "2017-03-26 02:00"
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with pytest.raises(pytz.NonExistentTimeError, match=msg):
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Timestamp("2017-03-26 02:00", tz="Europe/Paris")
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# GH#11708
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naive = Timestamp("2015-11-18 10:00:00")
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result = naive.tz_localize("UTC").tz_convert("Asia/Kolkata")
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expected = Timestamp("2015-11-18 15:30:00+0530", tz="Asia/Kolkata")
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assert result == expected
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# GH#15823
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result = Timestamp("2017-03-26 00:00", tz="Europe/Paris")
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expected = Timestamp("2017-03-26 00:00:00+0100", tz="Europe/Paris")
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assert result == expected
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result = Timestamp("2017-03-26 01:00", tz="Europe/Paris")
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expected = Timestamp("2017-03-26 01:00:00+0100", tz="Europe/Paris")
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assert result == expected
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msg = "2017-03-26 02:00"
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with pytest.raises(pytz.NonExistentTimeError, match=msg):
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Timestamp("2017-03-26 02:00", tz="Europe/Paris")
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result = Timestamp("2017-03-26 02:00:00+0100", tz="Europe/Paris")
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naive = Timestamp(result.value)
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expected = naive.tz_localize("UTC").tz_convert("Europe/Paris")
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assert result == expected
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result = Timestamp("2017-03-26 03:00", tz="Europe/Paris")
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expected = Timestamp("2017-03-26 03:00:00+0200", tz="Europe/Paris")
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assert result == expected
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@pytest.mark.parametrize(
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"tz",
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[
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pytz.timezone("US/Eastern"),
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gettz("US/Eastern"),
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"US/Eastern",
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"dateutil/US/Eastern",
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],
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)
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def test_timestamp_constructed_by_date_and_tz(self, tz):
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# GH#2993, Timestamp cannot be constructed by datetime.date
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# and tz correctly
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result = Timestamp(date(2012, 3, 11), tz=tz)
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expected = Timestamp("3/11/2012", tz=tz)
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assert result.hour == expected.hour
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assert result == expected
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@pytest.mark.parametrize(
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"tz",
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[
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pytz.timezone("US/Eastern"),
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gettz("US/Eastern"),
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"US/Eastern",
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"dateutil/US/Eastern",
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],
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)
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def test_timestamp_add_timedelta_push_over_dst_boundary(self, tz):
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# GH#1389
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# 4 hours before DST transition
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stamp = Timestamp("3/10/2012 22:00", tz=tz)
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result = stamp + timedelta(hours=6)
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# spring forward, + "7" hours
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expected = Timestamp("3/11/2012 05:00", tz=tz)
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assert result == expected
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def test_timestamp_timetz_equivalent_with_datetime_tz(self, tz_naive_fixture):
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# GH21358
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tz = timezones.maybe_get_tz(tz_naive_fixture)
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stamp = Timestamp("2018-06-04 10:20:30", tz=tz)
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_datetime = datetime(2018, 6, 4, hour=10, minute=20, second=30, tzinfo=tz)
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result = stamp.timetz()
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expected = _datetime.timetz()
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assert result == expected
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