'Set the revocation timestamp
:param when: A string giving the timestamp, in the format:
YYYYMMDDhhmmssZ
YYYYMMDDhhmmss+hhmm
YYYYMMDDhhmmss-hhmm
:return: None'

def set_rev_date(self, when):

    return _set_asn1_time(self._revoked.revocationDate, when)
