tests/utils/test_datetime.py

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from datetime import datetime, timezone, tzinfo

import pytest
import pytz

from pyiceberg.utils.datetime import datetime_to_millis, millis_to_datetime

timezones = [
    pytz.timezone("Etc/GMT"),
    pytz.timezone("Etc/GMT+0"),
    pytz.timezone("Etc/GMT+1"),
    pytz.timezone("Etc/GMT+10"),
    pytz.timezone("Etc/GMT+11"),
    pytz.timezone("Etc/GMT+12"),
    pytz.timezone("Etc/GMT+2"),
    pytz.timezone("Etc/GMT+3"),
    pytz.timezone("Etc/GMT+4"),
    pytz.timezone("Etc/GMT+5"),
    pytz.timezone("Etc/GMT+6"),
    pytz.timezone("Etc/GMT+7"),
    pytz.timezone("Etc/GMT+8"),
    pytz.timezone("Etc/GMT+9"),
    pytz.timezone("Etc/GMT-0"),
    pytz.timezone("Etc/GMT-1"),
    pytz.timezone("Etc/GMT-10"),
    pytz.timezone("Etc/GMT-11"),
    pytz.timezone("Etc/GMT-12"),
    pytz.timezone("Etc/GMT-13"),
    pytz.timezone("Etc/GMT-14"),
    pytz.timezone("Etc/GMT-2"),
    pytz.timezone("Etc/GMT-3"),
    pytz.timezone("Etc/GMT-4"),
    pytz.timezone("Etc/GMT-5"),
    pytz.timezone("Etc/GMT-6"),
    pytz.timezone("Etc/GMT-7"),
    pytz.timezone("Etc/GMT-8"),
    pytz.timezone("Etc/GMT-9"),
]


def test_datetime_to_millis() -> None:
    dt = datetime(2023, 7, 10, 10, 10, 10, 123456)
    expected = int(dt.replace(tzinfo=timezone.utc).timestamp() * 1_000)
    datetime_millis = datetime_to_millis(dt)
    assert datetime_millis == expected


@pytest.mark.parametrize("tz", timezones)
def test_datetime_tz_to_millis(tz: tzinfo) -> None:
    dt = datetime(2023, 7, 10, 10, 10, 10, 123456, tzinfo=tz)
    expected = int(dt.timestamp() * 1_000)
    datetime_millis = datetime_to_millis(dt)
    assert datetime_millis == expected


def test_millis_to_datetime() -> None:
    assert millis_to_datetime(1690971805918) == datetime(2023, 8, 2, 10, 23, 25, 918000)