'return the time value (in seconds since 1970)'

def parse(self, *args, **kwargs):

    value = self.__call__(*args, **kwargs)
    if value:
        try:
            return mktime_tz(parsedate_tz(value))
        except (TypeError, OverflowError):
            raise HTTPBadRequest(('Received    an    ill-formed    timestamp    for    %s:    %s\r\n' % (self.name, value)))
