On 07 Nov 2012, at 3:57 PM, Jakob Bohm <jb-open...@wisemo.com> wrote:

> Look in the code that checks certificates for expiry (during certificate
> validation), it probably calls an appropriate subroutine on the expiry
> date in the X509 cert.

Already did that, the function you're referring to is called X509_cmp_time() 
declared in crypto/x509/x509_vfy.c. This function seems to return a -1, 0 or 1 
in some cases, it doesn't return the different between the times as you would 
expect it to.

Regards,
Graham
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