Websites prove their identity via certificates, which are valid for a set time period. The certificate for { $hostname } expired on { $not-after-local-time }.
Mae gwefannau yn profi eu hunaniaeth trwy dystysgrifau, sy'n ddilys am gyfnod penodol. Daeth y dystysgrif ar gyfer { $hostname } i ben ar { $not-after-local-time }.