2.15 pKIOverlapPeriod Attribute
The pKIOverlapPeriod attribute represents the time before a certificate expires, during which time, clients need to send a certificate renewal request, as described in [MS-CERSOD] sections 2.5.2, 2.5.3.1, and 3.6. The attribute is an 8-byte octet string that initializes the FILETIME structure that is defined in [MS-DTYP] section 2.3.3.
For schema details of this attribute, see [MS-ADA3] section 2.103.