As can FlipCTime... as long as you convert it all to seconds first. 
$LastRun=Val(ReadValue('HKCU\Software\KiXtart\Weekly','LastRun'))
$CurCTime=Val(FlipCTime(@Date,@Time,-6))
If $CurCTime-$LastRun>604800 ;one week
...
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
