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import re
from datetime import datetime
from datetime import timedelta
_OFFSET_REGEX = re.compile(r'(\+|\-)(\d\d):(\d\d)$')
_SYMBOLS_REGEX = re.compile(r'[-:Z]')
def parse_datetime(timestamp):
offset_matches = _OFFSET_REGEX.findall(timestamp)
if len(offset_matches) == 0:
timestamp = _SYMBOLS_REGEX.sub('', timestamp)
without_seconds = datetime.strptime(timestamp[:13], '%Y%m%dT%H%M')
seconds = timedelta(seconds=float(timestamp[13:]))
return without_seconds + seconds
else:
time_without_offset = parse_datetime(timestamp[:-6])
try:
offset_matches = offset_matches[0]
offset_is_negative = offset_matches[0] == '-'
offset_hours = int(offset_matches[1])
offset_minutes = int(offset_matches[2])
except IndexError:
pass
offset = timedelta(hours=offset_hours, minutes=offset_minutes)
if offset_is_negative:
return time_without_offset + offset
else:
return time_without_offset - offset
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