Write exam on cert expiration date

Hi All,

Is it possible to write a 642 level exam on the date one's CCNA expires?

E.g., if my CCNA expires July 1, can I write a CCNP exam on July 1 or is the latest date June 30?

The date references I've seen on Cisco's site usually state "before", but I'm curious if "on" is valid as well.

Thanks