Hello all -

Need to know if there is a way to define a varible based on date, and then query an AD Ldap field based on that variable.  Bellow is rudimentary code of what I am trying to do, just not sure if I can use the defined vairbale in my search string.  Tried this but it appears it is returning results based on the literal text, and not the varibale value. 
[string] $a=get-date -uformat %m%y [string] $revoke = $a - 200 dsquery * forestroot -filter "&(objectClass=User)(description=*$revoke*)" -limit 0 -attr sAMAccountName -l

Thanks for the help!

lets start by fixing one piece of code and getting rid of $a:
$revoke = Get-Date -UFormat %m%y ((get-date).AddMonths(-2))

You may need $() around $revoke in your command:
dsquery * forestroot -filter "&(objectClass=User)(description=*$($revoke)*)" -limit 0 -attr sAMAccountName -l

The $ tells powershell to execute the expression contained within the proceeding parenthesis. Therefore, this could be done as a oneliner, but makes it a bit long:

dsquery * forestroot -filter "&(objectClass=User)(description=*$(Get-Date -UFormat %m%y ((get-date).AddMonths(-2)))*)" -limit 0 -attr sAMAccountName -l