よく忘れるのでメモ
openssl x509 -in /etc/letsencrypt/live/ドメイン/cert.pem -noout -dates
notBefore=Feb 1 04:28:18 2018 GMT
notAfter=May 2 04:28:18 2018 GMT
notBefore：証明書の生成日時
notAfter:証明書の有効期限
More than 5 years have passed since last update.
黒い画面でLet's EncriptのSSL証明書の有効期限を確認する
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