parse_timestamp.py

PARSEPATTERN = re.compile(r"(?P<year>\d{4})-(?P<month>\d{2})-(?P<day>\d{2})T(?P<hour>\d{2}):(?P<minute>\d{2}):(?P<second>\d{2})\.000Z")
def _parse_timestamp_with_tzinfo(value, tzinfo):
    """Parse timestamp with pluggable tzinfo options."""
    if isinstance(value, (str,)):
        match = PARSEPATTERN.match(value)
        if match is not None:
            try:
                return datetime.datetime(**{k: int(v) for k, v in match.groupdict().items()}).replace(tzinfo=tzinfo())
            except ValueError:
                pass
    if isinstance(value, (int, float)):
        # Possibly an epoch time.
        return datetime.datetime.fromtimestamp(value, tzinfo())
    else:
        try:
            return datetime.datetime.fromtimestamp(float(value), tzinfo())
        except (TypeError, ValueError):
            pass
    try:
        # In certain cases, a timestamp marked with GMT can be parsed into a
        # different time zone, so here we provide a context which will
        # enforce that GMT == UTC.
        return dateutil.parser.parse(value, tzinfos={'GMT': tzutc()})
    except (TypeError, ValueError) as e:
        raise ValueError('Invalid timestamp "%s": %s' % (value, e))