cleanup-maildir.py 文件源码

def getDateSent(self):
        """Get the time of sending from the Date header

        Returns a time object using time.mktime.  Not very reliable, because
        the Date header can be missing or spoofed (and often is, by spammers).
        Throws a MessageDateError if the Date header is missing or invalid.
        """
        dh = self.getheader('Date')
        if dh == None: 
            return None
        try:
            return time.mktime(rfc822.parsedate(dh))
        except ValueError:
            raise MessageDateError("message has missing or bad Date")
        except TypeError:  # gets thrown by mktime if parsedate returns None
            raise MessageDateError("message has missing or bad Date")
        except OverflowError:
            raise MessageDateError("message has missing or bad Date")