SSL certificate expiry checker
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Why this is worth watching on its own
An expired certificate does not degrade gracefully - the moment the clock passes the expiry date, every browser stops connecting and shows a hard warning, regardless of how well everything else about the site is configured. It is one of very few outages that is entirely predictable weeks in advance and still catches sites off guard.
Typical certificate lifetimes
Certificate authorities have progressively shortened maximum validity - modern publicly-trusted certificates are commonly issued for 90 days (automated issuance, like Let's Encrypt) up to about 13 months (the current CA/Browser Forum maximum for manually-issued certificates). A certificate claiming a multi-year lifetime is worth double-checking; it may predate current limits or not be from a publicly-trusted CA at all.
What "days remaining" does not tell you
Whether renewal is automated. A short-lived certificate that renews itself (common with Let's Encrypt and similar) is normal to see with only a few weeks left - the number alone does not distinguish that from a certificate genuinely about to lapse unattended.
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See the full SSL certificate checker for everything else on the certificate.
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