Perhaps we are speaking at cross-purposes, or at least with different meanings, but I know of no way to get a "modified date" on a marriage certificate. Possibly a new certification of a prior document, but it is hard to tell from your question. And the license is an entirely different document, and NEITHER the license nor the certificate have anything at all to do with the date of a decree of annulment. In short, your question is unclear.
If there has been an annulment, you can find out when it was by calling the Clerk of the Clark County Court (702-455-2591) and asking. Or contact any lawyer with access to the family court computer system and have them look it up by name. But if you have other questions you should gather whatever documents you have and go over them with a family law specialist to have those questions resolved.
Answered on Jan 08th, 2015 at 4:14 PM