Assuming you know how to do authorization in general and your problem is only the timing, here is the answer: use the type
System.DateTime. You can get current time using the static method
System.DateTime.Now or
System.DateTime.UtcNow (which is good when your application serves multiple time zones). For comparison, simply use operators "==", "!=", "<", ">", "<=" and ">=". That should be enough for all your purposes.
See
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[
^].
—SA
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