GeneralizedTime is an ASN.1 notation time type represented as a string. It encodes the calendar date and time of day, optionally including fractional seconds and an optional time zone offset.[1] While its structure is conceptually aligned with ISO 8601, the format is compact and does not use ISO 8601’s separators.

In contrast to the UTCTime class of ASN.1 the GeneralizedTime uses a four-digit representation of the year to avoid possible ambiguity. Another difference is the possibility to encode time information of any wanted precision via the fractional seconds element.

Examples from ITU-T X.680: 

"19851106210627.3"
local time 6 minutes, 27.3 seconds after 9 pm on 6 November 1985.

"19851106210627.3Z"
coordinated universal time as above.

"19851106210627.3-0500"
local time as in the first example, with local time 5 hours retarded in relation to coordinated universal time.

ASN.1 also defines a DateAndTime time format widely used in SNMP, that includes separator characters and does not pad the fields (e.g., "1985-11-6,21:6:27.3,-5:0").

References

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  1. ^ Adams, C.; Farrell, S.; Kause, K.; Maher, P.; Polk, W.; Thompson, T. (April 2002). Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile. RFC. IETF. doi:10.17487/RFC3280. Retrieved 2026-03-05.{{citation}}: CS1 maint: multiple names: authors list (link)

See also

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ISO 8601

also makes use of a subset of ISO 8601. The X.690 encoding standard's GeneralizedTime makes use of another subset of ISO 8601. As of 2006, the ISO week date

X.690

VideotexString Both 21 15 IA5String Both 22 16 UTCTime Both 23 17 GeneralizedTime Both 24 18 GraphicString Both 25 19 VisibleString Both 26 1A GeneralString