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