public newer than the signature

[Robert J. Hansen]

Andrew Berg wrote:
> Time for computers is generally just the number of seconds since January 
> 1, 1970 at 12:00:00 UTC if I'm not mistaken.

Time for UNIX systems is generally this way.  Win32 and MacOS (pre-OS X)
have their own ways of storing time.

It is ridiculously hard to come up with a robust time and date standard.
 This is why there are so many different, conflicting implementations
out there.

Note that in some instances, GnuPG will use an ISO date format as
opposed to seconds-since-Epoch.