Timestamp for playground and other pages

As the arduino is a ongoing development, pages may contain old data, or are only for specific versions of a board or IDE. It would be very handy to have something on a page to show in what timeframe the page was written or for what versions of hw/sw. please add at least a timestamp on the top of the page like this one: Arduino Playground - CustomizeArduinoIDE so we know if the info is valid.

tried to do that with pages I added, e.g. - Arduino Playground - StopWatchClass -

just add this to top of the page

(:table border=0 cellpadding=5 cellspacing=0:)
(:cell colspan=2:)
(:cellnr:) Last Modified: 
(:cell:) {$LastModified}
(:cellnr:) By:
(:cell:) {$LastModifiedBy}
(:cellnr:) Platform:
(:cell:) All
(:tableend:)