Opposite of Expiraton attribute?

[Matthew George]

Is there an attribute that is the opposite of expiration? 

I'm trying to setup accounts to have a specific login time range. 

For example; 
Start-Time >= 5 June 2011 00:00:00 
Expiration == 5 June 2011 02:00:00 

I've been hunting googling for hours but I've been unable to find an
attribute that would let me specific a "start-time" or a "valid-after"
attribute. 

Any suggestions?

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