storage.py 文件源码

def add_time_interval(base_time, interval, textparser=parsedatetime.Calendar()):
    """Parse the time specified time interval, and add it to the base_time

    The interval can be in the English-language format understood by
    parsedatetime, e.g., '10 days', '3 weeks', '6 months', '9 hours', or
    a sequence of such intervals like '6 months 1 week' or '3 days 12
    hours'. If an integer is found with no associated unit, it is
    interpreted by default as a number of days.

    :param datetime.datetime base_time: The time to be added with the interval.
    :param str interval: The time interval to parse.

    :returns: The base_time plus the interpretation of the time interval.
    :rtype: :class:`datetime.datetime`"""

    if interval.strip().isdigit():
        interval += " days"

    # try to use the same timezone, but fallback to UTC
    tzinfo = base_time.tzinfo or pytz.UTC

    return textparser.parseDT(interval, base_time, tzinfo=tzinfo)[0]