The steps to take to extend the dates on a certificate vary depending on where the certificate was generated and how it was signed.
If the Certificate was generated on site and signed by a local CA, meaning a CA certificate also generated on site, then the following steps can be taken to extend the date.
**Step one insures that if any mistakes are made that the original certificate
can be obtained and put back into place**
Release: TOPSEC00200-15-Top Secret-Security