On Wed, Sep 06, 2017, Michael Wojcik wrote: > > From: openssl-users [mailto:openssl-users-boun...@openssl.org] On Behalf > > Of Dr. Stephen Henson > > Sent: Wednesday, September 06, 2017 10:26 > > > > No but there is a a round about way of achieving the same result. The > > ASN1_TIME_diff() function will determine the difference between two > > ASN1_TIME structures and return the result as a number of days and seconds. > > > > So if you set one to the epoch time you can then calculate the time_t from > > the difference. > > That's almost certainly a much better approach than the one I described in my > previous email. > > I assume ASN1_TIME_diff takes into account ASN.1 UTC Time versus Generalized > Time, and timezone information. Though it wouldn't be hard to have a few > different ASN1_TIME structures for the various permutations. >
Yes ASN1_TIME corresponds to the ASN.1 Time structure which ia a choice of UTCTime and GeneralizedTime it acts in an appropriate way depending on the type that has been passed in. Timezones should be handled properly though there was a recent bug fixed: timezones are only rarely encountered in practice and not legal in many standards (e.g. RFC5280). Steve. -- Dr Stephen N. Henson. OpenSSL project core developer. Commercial tech support now available see: http://www.openssl.org -- openssl-users mailing list To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
