mirror of
https://github.com/encode/django-rest-framework.git
synced 2025-11-04 09:57:55 +03:00
62abf6ac1f
* Use ZoneInfo as primary source of timezone data * Update tests/test_fields.py --------- Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>
26 lines
1.1 KiB
Python
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
|