System.Security.Cryptography.X509Certificates.X509Certificate.GetNotBefore C# (CSharp) Method

        internal DateTime GetNotBefore()
        {
            ThrowIfInvalid();

            DateTime notBefore = _lazyNotBefore;
            if (notBefore == DateTime.MinValue)
                notBefore = _lazyNotBefore = Pal.NotBefore;
            return notBefore;
        }