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b062e8332f
This adds support for syntax like: !time(Jun 7 2017, 6:30 PM) so that everyone sees the time in their own local timezone. This can be used when scheduling online meetings, etc. This adds some hardcoded values for timezones, because of there being no sureshot way of determining the timezone easily. However, since the main way of using the feature should be a typeahead for entering the time, this shouldn't be cause of much concern. Fixes #5176.
60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
from typing import List, Dict, Union, Any
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import pytz
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import datetime
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def get_all_timezones() -> List[str]:
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return sorted(pytz.all_timezones)
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def get_timezone(tz: str) -> datetime.tzinfo:
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return pytz.timezone(tz)
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# This method carefully trims a list of common timezones in the pytz
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# database and handles duplicate abbreviations in favor of the most
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# common/popular offset. The output of this can be directly passed as
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# tz_data to dateutil.parser.
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def _calculate_timezones() -> Dict[str, Union[int, Any]]:
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tzdata = {}
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normal = datetime.datetime(2009, 9, 1) # Any random date is fine here.
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for str in pytz.all_timezones:
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tz = pytz.timezone(str)
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offset = tz.utcoffset(normal).seconds # type: ignore[union-attr] # mypy detects utcoffset returns None.
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timedelta = tz.utcoffset(normal)
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if not timedelta:
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continue
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offset = timedelta.seconds
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tz_name = tz.tzname(normal)
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tzdata[tz_name] = offset
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# Handle known duplicates/exceptions.
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# IST: Asia/Kolkata and Europe/Dublin.
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if tz_name == 'IST':
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tzdata[tz_name] = 19800 # Asia/Kolkata
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# CDT: America/AlmostAll and America/Havana.
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if tz_name == 'CDT':
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tzdata[tz_name] = -68400 # America/AlmostAll
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# CST America/Belize -64800
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# CST America/Costa_Rica -64800
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# CST America/El_Salvador -64800
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# CST America/Guatemala -64800
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# CST America/Managua -64800
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# CST America/Regina -64800
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# CST America/Swift_Current -64800
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# CST America/Tegucigalpa -64800
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# CST Asia/Macau 28800
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# CST Asia/Shanghai 28800
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# CST Asia/Taipei 28800
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if tz_name == 'CST':
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tzdata[tz_name] = -64800 # America/All
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return tzdata
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timezone_data = None
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# _calculate_timezones takes about 25ms to run, so we want to cache
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# its results (while avoiding running it on process startup since we
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# only need it for markdown rendering).
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def get_common_timezones() -> Dict[str, Union[int, Any]]:
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global timezone_data
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if timezone_data is None:
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timezone_data = _calculate_timezones()
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return timezone_data
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