You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
227 lines
7.6 KiB
227 lines
7.6 KiB
"""
|
|
Tests for DateOffset additions over Daylight Savings Time
|
|
"""
|
|
from datetime import timedelta
|
|
|
|
import pytest
|
|
import pytz
|
|
|
|
from pandas._libs.tslibs import Timestamp
|
|
from pandas._libs.tslibs.offsets import (
|
|
BMonthBegin,
|
|
BMonthEnd,
|
|
BQuarterBegin,
|
|
BQuarterEnd,
|
|
BYearBegin,
|
|
BYearEnd,
|
|
CBMonthBegin,
|
|
CBMonthEnd,
|
|
CustomBusinessDay,
|
|
DateOffset,
|
|
Day,
|
|
MonthBegin,
|
|
MonthEnd,
|
|
QuarterBegin,
|
|
QuarterEnd,
|
|
SemiMonthBegin,
|
|
SemiMonthEnd,
|
|
Week,
|
|
YearBegin,
|
|
YearEnd,
|
|
)
|
|
|
|
from pandas.tests.tseries.offsets.test_offsets import get_utc_offset_hours
|
|
|
|
|
|
class TestDST:
|
|
|
|
# one microsecond before the DST transition
|
|
ts_pre_fallback = "2013-11-03 01:59:59.999999"
|
|
ts_pre_springfwd = "2013-03-10 01:59:59.999999"
|
|
|
|
# test both basic names and dateutil timezones
|
|
timezone_utc_offsets = {
|
|
"US/Eastern": {"utc_offset_daylight": -4, "utc_offset_standard": -5},
|
|
"dateutil/US/Pacific": {"utc_offset_daylight": -7, "utc_offset_standard": -8},
|
|
}
|
|
valid_date_offsets_singular = [
|
|
"weekday",
|
|
"day",
|
|
"hour",
|
|
"minute",
|
|
"second",
|
|
"microsecond",
|
|
]
|
|
valid_date_offsets_plural = [
|
|
"weeks",
|
|
"days",
|
|
"hours",
|
|
"minutes",
|
|
"seconds",
|
|
"milliseconds",
|
|
"microseconds",
|
|
]
|
|
|
|
def _test_all_offsets(self, n, **kwds):
|
|
valid_offsets = (
|
|
self.valid_date_offsets_plural
|
|
if n > 1
|
|
else self.valid_date_offsets_singular
|
|
)
|
|
|
|
for name in valid_offsets:
|
|
self._test_offset(offset_name=name, offset_n=n, **kwds)
|
|
|
|
def _test_offset(self, offset_name, offset_n, tstart, expected_utc_offset):
|
|
offset = DateOffset(**{offset_name: offset_n})
|
|
|
|
t = tstart + offset
|
|
if expected_utc_offset is not None:
|
|
assert get_utc_offset_hours(t) == expected_utc_offset
|
|
|
|
if offset_name == "weeks":
|
|
# dates should match
|
|
assert t.date() == timedelta(days=7 * offset.kwds["weeks"]) + tstart.date()
|
|
# expect the same day of week, hour of day, minute, second, ...
|
|
assert (
|
|
t.dayofweek == tstart.dayofweek
|
|
and t.hour == tstart.hour
|
|
and t.minute == tstart.minute
|
|
and t.second == tstart.second
|
|
)
|
|
elif offset_name == "days":
|
|
# dates should match
|
|
assert timedelta(offset.kwds["days"]) + tstart.date() == t.date()
|
|
# expect the same hour of day, minute, second, ...
|
|
assert (
|
|
t.hour == tstart.hour
|
|
and t.minute == tstart.minute
|
|
and t.second == tstart.second
|
|
)
|
|
elif offset_name in self.valid_date_offsets_singular:
|
|
# expect the singular offset value to match between tstart and t
|
|
datepart_offset = getattr(
|
|
t, offset_name if offset_name != "weekday" else "dayofweek"
|
|
)
|
|
assert datepart_offset == offset.kwds[offset_name]
|
|
else:
|
|
# the offset should be the same as if it was done in UTC
|
|
assert t == (tstart.tz_convert("UTC") + offset).tz_convert("US/Pacific")
|
|
|
|
def _make_timestamp(self, string, hrs_offset, tz):
|
|
if hrs_offset >= 0:
|
|
offset_string = f"{hrs_offset:02d}00"
|
|
else:
|
|
offset_string = f"-{(hrs_offset * -1):02}00"
|
|
return Timestamp(string + offset_string).tz_convert(tz)
|
|
|
|
def test_springforward_plural(self):
|
|
# test moving from standard to daylight savings
|
|
for tz, utc_offsets in self.timezone_utc_offsets.items():
|
|
hrs_pre = utc_offsets["utc_offset_standard"]
|
|
hrs_post = utc_offsets["utc_offset_daylight"]
|
|
self._test_all_offsets(
|
|
n=3,
|
|
tstart=self._make_timestamp(self.ts_pre_springfwd, hrs_pre, tz),
|
|
expected_utc_offset=hrs_post,
|
|
)
|
|
|
|
def test_fallback_singular(self):
|
|
# in the case of singular offsets, we don't necessarily know which utc
|
|
# offset the new Timestamp will wind up in (the tz for 1 month may be
|
|
# different from 1 second) so we don't specify an expected_utc_offset
|
|
for tz, utc_offsets in self.timezone_utc_offsets.items():
|
|
hrs_pre = utc_offsets["utc_offset_standard"]
|
|
self._test_all_offsets(
|
|
n=1,
|
|
tstart=self._make_timestamp(self.ts_pre_fallback, hrs_pre, tz),
|
|
expected_utc_offset=None,
|
|
)
|
|
|
|
def test_springforward_singular(self):
|
|
for tz, utc_offsets in self.timezone_utc_offsets.items():
|
|
hrs_pre = utc_offsets["utc_offset_standard"]
|
|
self._test_all_offsets(
|
|
n=1,
|
|
tstart=self._make_timestamp(self.ts_pre_springfwd, hrs_pre, tz),
|
|
expected_utc_offset=None,
|
|
)
|
|
|
|
offset_classes = {
|
|
MonthBegin: ["11/2/2012", "12/1/2012"],
|
|
MonthEnd: ["11/2/2012", "11/30/2012"],
|
|
BMonthBegin: ["11/2/2012", "12/3/2012"],
|
|
BMonthEnd: ["11/2/2012", "11/30/2012"],
|
|
CBMonthBegin: ["11/2/2012", "12/3/2012"],
|
|
CBMonthEnd: ["11/2/2012", "11/30/2012"],
|
|
SemiMonthBegin: ["11/2/2012", "11/15/2012"],
|
|
SemiMonthEnd: ["11/2/2012", "11/15/2012"],
|
|
Week: ["11/2/2012", "11/9/2012"],
|
|
YearBegin: ["11/2/2012", "1/1/2013"],
|
|
YearEnd: ["11/2/2012", "12/31/2012"],
|
|
BYearBegin: ["11/2/2012", "1/1/2013"],
|
|
BYearEnd: ["11/2/2012", "12/31/2012"],
|
|
QuarterBegin: ["11/2/2012", "12/1/2012"],
|
|
QuarterEnd: ["11/2/2012", "12/31/2012"],
|
|
BQuarterBegin: ["11/2/2012", "12/3/2012"],
|
|
BQuarterEnd: ["11/2/2012", "12/31/2012"],
|
|
Day: ["11/4/2012", "11/4/2012 23:00"],
|
|
}.items()
|
|
|
|
@pytest.mark.parametrize("tup", offset_classes)
|
|
def test_all_offset_classes(self, tup):
|
|
offset, test_values = tup
|
|
|
|
first = Timestamp(test_values[0], tz="US/Eastern") + offset()
|
|
second = Timestamp(test_values[1], tz="US/Eastern")
|
|
assert first == second
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"original_dt, target_dt, offset, tz",
|
|
[
|
|
pytest.param(
|
|
Timestamp("1900-01-01"),
|
|
Timestamp("1905-07-01"),
|
|
MonthBegin(66),
|
|
"Africa/Kinshasa",
|
|
marks=pytest.mark.xfail(
|
|
# error: Module has no attribute "__version__"
|
|
float(pytz.__version__) <= 2020.1, # type: ignore[attr-defined]
|
|
reason="GH#41906",
|
|
),
|
|
),
|
|
(
|
|
Timestamp("2021-10-01 01:15"),
|
|
Timestamp("2021-10-31 01:15"),
|
|
MonthEnd(1),
|
|
"Europe/London",
|
|
),
|
|
(
|
|
Timestamp("2010-12-05 02:59"),
|
|
Timestamp("2010-10-31 02:59"),
|
|
SemiMonthEnd(-3),
|
|
"Europe/Paris",
|
|
),
|
|
(
|
|
Timestamp("2021-10-31 01:20"),
|
|
Timestamp("2021-11-07 01:20"),
|
|
CustomBusinessDay(2, weekmask="Sun Mon"),
|
|
"US/Eastern",
|
|
),
|
|
(
|
|
Timestamp("2020-04-03 01:30"),
|
|
Timestamp("2020-11-01 01:30"),
|
|
YearBegin(1, month=11),
|
|
"America/Chicago",
|
|
),
|
|
],
|
|
)
|
|
def test_nontick_offset_with_ambiguous_time_error(original_dt, target_dt, offset, tz):
|
|
# .apply for non-Tick offsets throws AmbiguousTimeError when the target dt
|
|
# is dst-ambiguous
|
|
localized_dt = original_dt.tz_localize(tz)
|
|
|
|
msg = f"Cannot infer dst time from {target_dt}, try using the 'ambiguous' argument"
|
|
with pytest.raises(pytz.AmbiguousTimeError, match=msg):
|
|
localized_dt + offset
|
|
|