/// <summary>
/// Null fields are considered to be valid
/// </summary>
private static bool ValidateNotBefore(DateTime?notBefore, DateTime now, TimeSpan allowedClockSkew)
{
if (notBefore == null)
{
return(true);
}
return(TimeRestrictionValidation.NotBeforeValid(notBefore.Value, now, allowedClockSkew));
}
