class ExtractWeekDay(expression, tzinfo=None, **extra) [source]
-
lookup_name = 'week_day'
These are logically equivalent to Extract('date_field', lookup_name). Each class is also a Transform registered on DateField and DateTimeField as __(lookup_name), e.g. __year.
Since DateFields don’t have a time component, only Extract subclasses that deal with date-parts can be used with DateField:
>>> from datetime import datetime
>>> from django.utils import timezone
>>> from django.db.models.functions import (
... ExtractYear, ExtractMonth, ExtractDay, ExtractWeekDay
... )
>>> start_2015 = datetime(2015, 6, 15, 23, 30, 1, tzinfo=timezone.utc)
>>> end_2015 = datetime(2015, 6, 16, 13, 11, 27, tzinfo=timezone.utc)
>>> Experiment.objects.create(
... start_datetime=start_2015, start_date=start_2015.date(),
... end_datetime=end_2015, end_date=end_2015.date())
>>> Experiment.objects.annotate(
... year=ExtractYear('start_date'),
... month=ExtractMonth('start_date'),
... day=ExtractDay('start_date'),
... weekday=ExtractWeekDay('start_date'),
... ).values('year', 'month', 'day', 'weekday').get(
... end_date__year=ExtractYear('start_date'),
... )
{'year': 2015, 'month': 6, 'day': 15, 'weekday': 2}
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