imaplib.py 文件源码

def Time2Internaldate(date_time):

    """Convert date_time to IMAP4 INTERNALDATE representation.

    Return string in form: '"DD-Mmm-YYYY HH:MM:SS +HHMM"'.  The
    date_time argument can be a number (int or float) representing
    seconds since epoch (as returned by time.time()), a 9-tuple
    representing local time (as returned by time.localtime()), or a
    double-quoted string.  In the last case, it is assumed to already
    be in the correct format.
    """

    if isinstance(date_time, (int, float)):
        tt = time.localtime(date_time)
    elif isinstance(date_time, (tuple, time.struct_time)):
        tt = date_time
    elif isinstance(date_time, str) and (date_time[0],date_time[-1]) == ('"','"'):
        return date_time        # Assume in correct format
    else:
        raise ValueError("date_time not of a known type")

    dt = time.strftime("%d-%b-%Y %H:%M:%S", tt)
    if dt[0] == '0':
        dt = ' ' + dt[1:]
    if time.daylight and tt[-1]:
        zone = -time.altzone
    else:
        zone = -time.timezone
    return '"' + dt + " %+03d%02d" % divmod(zone//60, 60) + '"'