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import datetime, calendar, time

def timestamp2datetime(timestamp):
    return datetime.datetime.fromtimestamp(timestamp)

def date2timestamp(date):
    """local time"""
    return calendar.timegm(date.timetuple())

def date2timestamp_utc(date):
    """utc time"""
    return int(time.mktime(date.timetuple()))

def datetime2timestamp(year, month, day):
    return calendar.timegm(datetime.datetime(year, month, day).timetuple())

def …