mirror of https://github.com/zulip/zulip.git
45 lines
1.5 KiB
Python
45 lines
1.5 KiB
Python
import datetime
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import calendar
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from django.utils.timezone import utc as timezone_utc
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class TimezoneNotUTCException(Exception):
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pass
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def verify_UTC(dt: datetime.datetime) -> None:
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if dt.tzinfo is None or dt.tzinfo.utcoffset(dt) != timezone_utc.utcoffset(dt):
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raise TimezoneNotUTCException("Datetime %s does not have a UTC timezone." % (dt,))
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def convert_to_UTC(dt: datetime.datetime) -> datetime.datetime:
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if dt.tzinfo is None:
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return dt.replace(tzinfo=timezone_utc)
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return dt.astimezone(timezone_utc)
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def floor_to_hour(dt: datetime.datetime) -> datetime.datetime:
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verify_UTC(dt)
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return datetime.datetime(*dt.timetuple()[:4]) \
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.replace(tzinfo=timezone_utc)
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def floor_to_day(dt: datetime.datetime) -> datetime.datetime:
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verify_UTC(dt)
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return datetime.datetime(*dt.timetuple()[:3]) \
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.replace(tzinfo=timezone_utc)
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def ceiling_to_hour(dt: datetime.datetime) -> datetime.datetime:
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floor = floor_to_hour(dt)
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if floor == dt:
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return floor
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return floor + datetime.timedelta(hours=1)
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def ceiling_to_day(dt: datetime.datetime) -> datetime.datetime:
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floor = floor_to_day(dt)
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if floor == dt:
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return floor
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return floor + datetime.timedelta(days=1)
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def timestamp_to_datetime(timestamp: float) -> datetime.datetime:
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return datetime.datetime.fromtimestamp(float(timestamp), tz=timezone_utc)
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def datetime_to_timestamp(dt: datetime.datetime) -> int:
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verify_UTC(dt)
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return calendar.timegm(dt.timetuple())
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