pendulum/tests/datetime/test_start_end_of.py at f5330069d28e3610ee46571018fa03448ca879a1 · python-pendulum/pendulum · GitHub

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from __future__ import annotations

import pytest

import pendulum

from tests.conftest import assert_datetime


def test_start_of_second():
    d = pendulum.now()
    new = d.start_of("second")
    assert isinstance(new, pendulum.DateTime)
    assert_datetime(new, d.year, d.month, d.day, d.hour, d.minute, d.second, 0)


def test_end_of_second():
    d = pendulum.now()
    new = d.end_of("second")
    assert isinstance(new, pendulum.DateTime)
    assert_datetime(new, d.year, d.month, d.day, d.hour, d.minute, d.second, 999999)


def test_start_of_minute():
    d = pendulum.now()
    new = d.start_of("minute")
    assert isinstance(new, pendulum.DateTime)
    assert_datetime(new, d.year, d.month, d.day, d.hour, d.minute, 0, 0)


def test_end_of_minute():
    d = pendulum.now()
    new = d.end_of("minute")
    assert isinstance(new, pendulum.DateTime)
    assert_datetime(new, d.year, d.month, d.day, d.hour, d.minute, 59, 999999)


def test_start_of_hour():
    d = pendulum.now()
    new = d.start_of("hour")
    assert isinstance(new, pendulum.DateTime)
    assert_datetime(new, d.year, d.month, d.day, d.hour, 0, 0, 0)


def test_end_of_hour():
    d = pendulum.now()
    new = d.end_of("hour")
    assert isinstance(new, pendulum.DateTime)
    assert_datetime(new, d.year, d.month, d.day, d.hour, 59, 59, 999999)


def test_start_of_day():
    d = pendulum.now()
    new = d.start_of("day")
    assert isinstance(new, pendulum.DateTime)
    assert_datetime(new, d.year, d.month, d.day, 0, 0, 0, 0)


def test_end_of_day():
    d = pendulum.now()
    new = d.end_of("day")
    assert isinstance(new, pendulum.DateTime)
    assert_datetime(new, d.year, d.month, d.day, 23, 59, 59, 999999)


def test_start_of_month_is_fluid():
    d = pendulum.now()
    assert isinstance(d.start_of("month"), pendulum.DateTime)


def test_start_of_month_from_now():
    d = pendulum.now()
    new = d.start_of("month")
    assert_datetime(new, d.year, d.month, 1, 0, 0, 0, 0)


def test_start_of_month_from_last_day():
    d = pendulum.datetime(2000, 1, 31, 2, 3, 4)
    new = d.start_of("month")
    assert_datetime(new, 2000, 1, 1, 0, 0, 0, 0)


def test_start_of_year_is_fluid():
    d = pendulum.now()
    new = d.start_of("year")
    assert isinstance(new, pendulum.DateTime)


def test_start_of_year_from_now():
    d = pendulum.now()
    new = d.start_of("year")
    assert_datetime(new, d.year, 1, 1, 0, 0, 0, 0)


def test_start_of_year_from_first_day():
    d = pendulum.datetime(2000, 1, 1, 1, 1, 1)
    new = d.start_of("year")
    assert_datetime(new, 2000, 1, 1, 0, 0, 0, 0)


def test_start_of_year_from_last_day():
    d = pendulum.datetime(2000, 12, 31, 23, 59, 59)
    new = d.start_of("year")
    assert_datetime(new, 2000, 1, 1, 0, 0, 0, 0)


def test_end_of_month_is_fluid():
    d = pendulum.now()
    assert isinstance(d.end_of("month"), pendulum.DateTime)


def test_end_of_month():
    d = pendulum.datetime(2000, 1, 1, 2, 3, 4).end_of("month")
    new = d.end_of("month")
    assert_datetime(new, 2000, 1, 31, 23, 59, 59)


def test_end_of_month_from_last_day():
    d = pendulum.datetime(2000, 1, 31, 2, 3, 4)
    new = d.end_of("month")
    assert_datetime(new, 2000, 1, 31, 23, 59, 59)


def test_end_of_year_is_fluid():
    d = pendulum.now()
    assert isinstance(d.end_of("year"), pendulum.DateTime)


def test_end_of_year_from_now():
    d = pendulum.now().end_of("year")
    new = d.end_of("year")
    assert_datetime(new, d.year, 12, 31, 23, 59, 59, 999999)


def test_end_of_year_from_first_day():
    d = pendulum.datetime(2000, 1, 1, 1, 1, 1)
    new = d.end_of("year")
    assert_datetime(new, 2000, 12, 31, 23, 59, 59, 999999)


def test_end_of_year_from_last_day():
    d = pendulum.datetime(2000, 12, 31, 23, 59, 59, 999999)
    new = d.end_of("year")
    assert_datetime(new, 2000, 12, 31, 23, 59, 59, 999999)


def test_start_of_decade_is_fluid():
    d = pendulum.now()
    assert isinstance(d.start_of("decade"), pendulum.DateTime)


def test_start_of_decade_from_now():
    d = pendulum.now()
    new = d.start_of("decade")
    assert_datetime(new, d.year - d.year % 10, 1, 1, 0, 0, 0, 0)


def test_start_of_decade_from_first_day():
    d = pendulum.datetime(2000, 1, 1, 1, 1, 1)
    new = d.start_of("decade")
    assert_datetime(new, 2000, 1, 1, 0, 0, 0, 0)


def test_start_of_decade_from_last_day():
    d = pendulum.datetime(2009, 12, 31, 23, 59, 59)
    new = d.start_of("decade")
    assert_datetime(new, 2000, 1, 1, 0, 0, 0, 0)


def test_end_of_decade_is_fluid():
    d = pendulum.now()
    assert isinstance(d.end_of("decade"), pendulum.DateTime)


def test_end_of_decade_from_now():
    d = pendulum.now()
    new = d.end_of("decade")
    assert_datetime(new, d.year - d.year % 10 + 9, 12, 31, 23, 59, 59, 999999)


def test_end_of_decade_from_first_day():
    d = pendulum.datetime(2000, 1, 1, 1, 1, 1)
    new = d.end_of("decade")
    assert_datetime(new, 2009, 12, 31, 23, 59, 59, 999999)


def test_end_of_decade_from_last_day():
    d = pendulum.datetime(2009, 12, 31, 23, 59, 59, 999999)
    new = d.end_of("decade")
    assert_datetime(new, 2009, 12, 31, 23, 59, 59, 999999)


def test_start_of_century_is_fluid():
    d = pendulum.now()
    assert isinstance(d.start_of("century"), pendulum.DateTime)


def test_start_of_century_from_now():
    d = pendulum.now()
    new = d.start_of("century")
    assert_datetime(new, d.year - d.year % 100 + 1, 1, 1, 0, 0, 0, 0)


def test_start_of_century_from_first_day():
    d = pendulum.datetime(2001, 1, 1, 1, 1, 1)
    new = d.start_of("century")
    assert_datetime(new, 2001, 1, 1, 0, 0, 0, 0)


def test_start_of_century_from_last_day():
    d = pendulum.datetime(2100, 12, 31, 23, 59, 59)
    new = d.start_of("century")
    assert_datetime(new, 2001, 1, 1, 0, 0, 0, 0)


def test_end_of_century_is_fluid():
    d = pendulum.now()
    assert isinstance(d.end_of("century"), pendulum.DateTime)


def test_end_of_century_from_now():
    now = pendulum.now()
    d = now.end_of("century")
    assert_datetime(d, now.year - now.year % 100 + 100, 12, 31, 23, 59, 59, 999999)


def test_end_of_century_from_first_day():
    d = pendulum.datetime(2001, 1, 1, 1, 1, 1)
    new = d.end_of("century")
    assert_datetime(new, 2100, 12, 31, 23, 59, 59, 999999)


def test_end_of_century_from_last_day():
    d = pendulum.datetime(2100, 12, 31, 23, 59, 59, 999999)
    new = d.end_of("century")
    assert_datetime(new, 2100, 12, 31, 23, 59, 59, 999999)


def test_average_is_fluid():
    d = pendulum.now().average()
    assert isinstance(d, pendulum.DateTime)


def test_average_from_same():
    d1 = pendulum.datetime(2000, 1, 31, 2, 3, 4)
    d2 = pendulum.datetime(2000, 1, 31, 2, 3, 4).average(d1)
    assert_datetime(d2, 2000, 1, 31, 2, 3, 4)


def test_average_from_greater():
    d1 = pendulum.datetime(2000, 1, 1, 1, 1, 1, tz="local")
    d2 = pendulum.datetime(2009, 12, 31, 23, 59, 59, tz="local").average(d1)
    assert_datetime(d2, 2004, 12, 31, 12, 30, 30)


def test_average_from_lower():
    d1 = pendulum.datetime(2009, 12, 31, 23, 59, 59, tz="local")
    d2 = pendulum.datetime(2000, 1, 1, 1, 1, 1, tz="local").average(d1)
    assert_datetime(d2, 2004, 12, 31, 12, 30, 30)


def start_of_with_invalid_unit():
    with pytest.raises(ValueError):
        pendulum.now().start_of("invalid")


def end_of_with_invalid_unit():
    with pytest.raises(ValueError):
        pendulum.now().end_of("invalid")


def test_start_of_with_transition():
    d = pendulum.datetime(2013, 10, 27, 23, 59, 59, tz="Europe/Paris")
    assert d.offset == 3600
    assert d.start_of("month").offset == 7200
    assert d.start_of("day").offset == 7200
    assert d.start_of("year").offset == 3600


def test_start_of_on_date_before_transition():
    d = pendulum.datetime(2013, 10, 27, 0, 59, 59, tz="UTC").in_timezone("Europe/Paris")
    assert d.offset == 7200
    assert d.start_of("minute").offset == 7200
    assert d.start_of("hour").offset == 7200
    assert d.start_of("day").offset == 7200
    assert d.start_of("month").offset == 7200
    assert d.start_of("year").offset == 3600


def test_start_of_on_date_after_transition():
    d = pendulum.datetime(2013, 10, 27, 1, 59, 59, tz="UTC").in_timezone("Europe/Paris")
    assert d.offset == 3600
    assert d.start_of("minute").offset == 3600
    assert d.start_of("hour").offset == 3600
    assert d.start_of("day").offset == 7200
    assert d.start_of("month").offset == 7200
    assert d.start_of("year").offset == 3600


def test_end_of_with_transition():
    d = pendulum.datetime(2013, 3, 31, tz="Europe/Paris")
    assert d.offset == 3600
    assert d.end_of("month").offset == 7200
    assert d.end_of("day").offset == 7200
    assert d.end_of("year").offset == 3600


def test_end_of_on_date_before_transition():
    d = pendulum.datetime(2013, 10, 27, 0, 0, 0, tz="UTC").in_timezone("Europe/Paris")
    assert d.offset == 7200
    assert d.end_of("minute").offset == 7200
    assert d.end_of("hour").offset == 7200
    assert d.end_of("day").offset == 3600
    assert d.end_of("month").offset == 3600
    assert d.end_of("year").offset == 3600


def test_end_of_on_date_after_transition():
    d = pendulum.datetime(2013, 10, 27, 1, 0, 0, tz="UTC").in_timezone("Europe/Paris")
    assert d.offset == 3600
    assert d.end_of("minute").offset == 3600
    assert d.end_of("hour").offset == 3600
    assert d.end_of("day").offset == 3600
    assert d.end_of("month").offset == 3600
    assert d.end_of("year").offset == 3600


def test_start_of_day_when_midnight_does_not_exist():
    # Chile/Continental springs forward exactly at midnight on 2025-09-07,
    # so 00:00:00 does not exist that day. start_of("day") must resolve to the
    # first valid instant of the day (01:00:00-03:00), not fall back into the
    # previous day. See issue #915.
    d = pendulum.datetime(2025, 9, 6, 0, 0, tz="Chile/Continental").add(days=1)
    new = d.start_of("day")

    assert new.day == 7
    assert_datetime(new, 2025, 9, 7, 1, 0, 0, 0)
    assert new.offset == -3 * 3600
    # start_of("day") must be idempotent even across the midnight gap.
    assert new == new.start_of("day")