The maximum validity period of Web server certificates (TLS certificates), issued as from today, is 398 days (13 months), less than half the maximum validity period so far (825 days or 27 months). All certificates that are issued with a longer validity period will be rejected by Apple, Google and Mozilla (which affects Safari, Chrome, Edge and Firefox), in a move that aims to increase the security of web sites.

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References:

• Maximum Lifespan of SSL/TLS Certificates is 398 Days Starting Today
• New SSL/TLS Certificates Lifespan: Why Capping Certificate validity improve security?
• Reduced lifespan of TLS certificates could cause increase in outages