X509Certificate.getNotBefore

Gets the {@code notBefore} date from the validity period of the certificate. The relevant ASN.1 definitions are: <pre> validity Validity

Validity ::= SEQUENCE { notBefore CertificateValidityDate, notAfter CertificateValidityDate }

CertificateValidityDate ::= CHOICE { utcTime UTCTime, generalTime GeneralizedTime } </pre>

@return the start date of the validity period. @see #checkValidity

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