django-rest-framework/rest_framework/utils/timezone.py
Maxwell Muoto 62abf6ac1f
Use ZoneInfo as primary source of timezone data (#8924)
* Use ZoneInfo as primary source of timezone data

* Update tests/test_fields.py

---------

Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>
2023-04-08 15:16:00 +06:00

26 lines
1.1 KiB
Python

from datetime import datetime, timezone, tzinfo
def datetime_exists(dt):
"""Check if a datetime exists. Taken from: https://pytz-deprecation-shim.readthedocs.io/en/latest/migration.html"""
# There are no non-existent times in UTC, and comparisons between
# aware time zones always compare absolute times; if a datetime is
# not equal to the same datetime represented in UTC, it is imaginary.
return dt.astimezone(timezone.utc) == dt
def datetime_ambiguous(dt: datetime):
"""Check whether a datetime is ambiguous. Taken from: https://pytz-deprecation-shim.readthedocs.io/en/latest/migration.html"""
# If a datetime exists and its UTC offset changes in response to
# changing `fold`, it is ambiguous in the zone specified.
return datetime_exists(dt) and (
dt.replace(fold=not dt.fold).utcoffset() != dt.utcoffset()
)
def valid_datetime(dt):
"""Returns True if the datetime is not ambiguous or imaginary, False otherwise."""
if isinstance(dt.tzinfo, tzinfo) and not datetime_ambiguous(dt):
return True
return False