You can do this by drawing a conditional based off of TIMENOW (get the number that gives you via php "echo TIMENOW;") and then create a conditional based off of it.
PHP Code:
if($thread['dateline'] > 'X'){
}
Take this conditional and use it to wrap the necessary plugins. If you have knowledge of php, that would be the quickest fix atm. Will
try and see if i can provide an add-on or something for you guys soon if anything.