Every certificate has an end date, and you can look it up for any website. There are two simple ways to do it.
Click the padlock in the address bar and open the certificate details. The 'valid from' and 'valid to' dates are shown there. The exact menu names differ between browsers.
On many systems, this command prints the dates of a site's certificate: echo | openssl s_client -connect example.com:443 -servername example.com 2>/dev/null | openssl x509 -noout -dates
notBefore is the start and notAfter is the end. The certificate stops being valid at the end time, not at midnight of the end day, so check the full time. Note the date together with the time.
Mail servers and other services can have their own certificates on other ports. A website check does not cover them.
SSL Domain Detective gathers the certificate end dates of your domains in one coloured list. Open SSL Domain Detective
SSL Domain Detective is now available on the App Store.
Last reviewed: 2026-11-02
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