!!! Overview
[{$pagename}] (Expiration Time) __OPTIONAL__ [Reserved Claim Name] identifies the expiration time on or after which the [JSON Web Token] [MUST NOT] be accepted for processing. 

The processing of the "[{$pagename}]" [claim] requires that the current date/time [MUST] be before the expiration date/time listed in the "[{$pagename}]" claim.

Implementers [MAY] provide for some small leeway, usually no more than a few minutes, to account for [clock skew].  

The value [MUST] be a number containing a [NumericDate] value.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]