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56 lines
1.5 KiB
Python
56 lines
1.5 KiB
Python
import pytz
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import re
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from datetime import datetime as dt
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from typing import Optional
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from dateutil import parser
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from dateutil.tz import gettz
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from dateutil.relativedelta import relativedelta
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TIME_RE_STRING = r"\s?".join(
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[
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r"((?P<years>\d+?)\s?(years?|y))?",
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r"((?P<months>\d+?)\s?(months?|mt))?",
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r"((?P<weeks>\d+?)\s?(weeks?|w))?",
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r"((?P<days>\d+?)\s?(days?|d))?",
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r"((?P<hours>\d+?)\s?(hours?|hrs|hr?))?",
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r"((?P<minutes>\d+?)\s?(minutes?|mins?|m(?!o)))?", # prevent matching "months"
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r"((?P<seconds>\d+?)\s?(seconds?|secs?|s))?",
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]
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)
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TIME_RE = re.compile(TIME_RE_STRING, re.I)
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def gen_tzinfos():
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for zone in pytz.common_timezones:
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try:
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tzdate = pytz.timezone(zone).localize(dt.utcnow(), is_dst=None)
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except pytz.NonExistentTimeError:
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pass
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else:
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tzinfo = gettz(zone)
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if tzinfo:
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yield tzdate.tzname(), tzinfo
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def parse_time(datetimestring: str):
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tzinfo = dict(gen_tzinfos())
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ret = parser.parse(datetimestring, tzinfos=tzinfo)
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if ret.tzinfo is not None:
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ret = ret.astimezone(pytz.utc)
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return ret
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def parse_time_naive(datetimestring: str):
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return parser.parse(datetimestring)
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def parse_timedelta(argument: str) -> Optional[relativedelta]:
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matches = TIME_RE.match(argument)
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if matches:
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params = {k: int(v) for k, v in matches.groupdict().items() if v}
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if params:
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return relativedelta(**params)
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return None
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