[gnutls-devel] GnuTLS | The incorrect UTC time value. (#1675)

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Qianxin Cheng created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1675



## Description of problem:
The RFC standard for X.509 CRL restricts the thisUpdate field to only two formats: UTCTime (YYMMDDHHMMSSZ) in ASN.1 representation and GeneralizedTime (YYYYMMDDHHMMSSZ). However, GnuTLS 3.7.11 accepts the thisUpdate field format as (YYYYMMDDHHZ), with a value like ("2017090721Z") in the CRL.

## Version of gnutls used:
GnuTLS 3.8.9

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)
Ubuntu

## How reproducible:
certtool --crl-info --inder --infile crl_file_gn_time.der

## Actual results:
CRL的This Update值被打印为Issued: Wed Dec 31 23:59:59 UTC 1969

## Expected results:
The RFC standard for X.509 CRL restricts the thisUpdate field to only two formats: ASN.1 encoded UTCTime (YYMMDDHHMMSSZ) and GeneralizedTime (YYYYMMDDHHMMSSZ). Therefore, it should reject a CRL with a thisUpdate field in the format (YYYYMMDDHHZ), with a value like ("2017090721Z").[crl_file_gn_time.der](/uploads/dbe2c4200feb727100571c3392d1feb2/crl_file_gn_time.der)

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