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move days_ago to utils and make it tz aware

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it's used in a few places - it should definitely know what timezones
are and return datetimes rather than dates, which are hard to work with
in terms of figuring out how tz aware they are.
This commit is contained in:
Leo Hemsted
2018-04-12 10:47:16 +01:00
parent 67019fc5a1
commit 5e702449cb
5 changed files with 35 additions and 15 deletions
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9
app/utils.py
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@@ -39,7 +39,7 @@ def get_london_midnight_in_utc(date):
This function converts date to midnight as BST (British Standard Time) to UTC,
the tzinfo is lastly removed from the datetime because the database stores the timestamps without timezone.
:param date: the day to calculate the London midnight in UTC for
:return: the datetime of London midnight in UTC, for example 2016-06-17 = 2016-06-17 23:00:00
:return: the datetime of London midnight in UTC, for example 2016-06-17 = 2016-06-16 23:00:00
"""
return local_timezone.localize(datetime.combine(date, datetime.min.time())).astimezone(
pytz.UTC).replace(
@@ -90,3 +90,10 @@ def get_public_notify_type_text(notify_type, plural=False):
notify_type_text = 'text message'
return '{}{}'.format(notify_type_text, 's' if plural else '')
def days_ago(number_of_days):
"""
Returns midnight a number of days ago. Takes care of daylight savings etc.
"""
return get_london_midnight_in_utc(datetime.utcnow() - timedelta(number_of_days))