The class encapsulates the ASN.1 DER encoding/decoding work
with Validity structure which is the part of X.509 certificate
(as specified in RFC 3280 -
Internet X.509 Public Key Infrastructure.
Certificate and Certificate Revocation List (CRL) Profile.
http://www.ietf.org/rfc/rfc3280.txt):
Validity ::= SEQUENCE {
notBefore Time,
notAfter Time
}
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