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Certificates contain a pair of absolute times in a Gregorian representation. The ASN.1 time format does support leap seconds (in the usual way, e.g., a time of

by wiml 5y ago

Certificates contain a pair of absolute times in a Gregorian representation. The ASN.1 time format does support leap seconds (in the usual way, e.g., a time of 23:59:60) but I don't know if X.500 or PKIX restricts that.