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Functions to parse datetime objects.
We're using regular expressions rather than time.strptime because:
- They provide both validation and parsing.
- They're more flexible for datetimes.
- The date/datetime/time constructors produce friendlier error messages.
Stolen from https://raw.githubusercontent.com/django/django/main/django/utils/dateparse.py at
9718fa2e8abe430c3526a9278dd976443d4ae3c6
Changed to:
* use standard python datetime types not django.utils.timezone
* raise ValueError when regex doesn't match rather than returning None
* support parsing unix timestamps for dates and datetimes
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Parse a date/int/float/string and return a datetime.date.
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Raise ValueError if the input isn't well formatted.
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Parse a time/string and return a datetime.time.
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Parse a datetime/int/float/string and return a datetime.datetime.
This function supports time zone offsets. When the input contains one,
the output uses a timezone with a fixed offset from UTC.
Raise ValueError if the input is well formatted but not a valid datetime.
Raise ValueError if the input isn't well formatted.
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Parse a duration int/float/string and return a datetime.timedelta.
The preferred format for durations in Django is '%d %H:%M:%S.%f'.
Also supports ISO 8601 representation.
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