@deftypefun {time_t} {gnutls_x509_crl_get_next_update} (gnutls_x509_crl_t @var{crl})
@var{crl}: should contain a @code{gnutls_x509_crl_t}  type

This function will return the time the next CRL will be issued.
This field is optional in a CRL so it might be normal to get an
error instead.

@strong{Returns:} when the next CRL will be issued, or (time_t)-1 on error.
@end deftypefun