A simple transient testing setup. Saves the current time in the DB and resets it after 5 mins

Wordpress transient

//Get transient value. If it's expired it will return jolly sod all...
$teat = get_transient( 'cool_cache_name');

//See what's in the variable
if($teat == ""){
  //Add the current time as a new transient, good value for testing. 
  //300 is equal to 5 minute - 60*60*12 is 12 hours
	set_transient( 'cool_cache_name', date('G:i'), 300 );
	echo(date('G:i'));
}else{
  //If there is a transient in place, echo that puppy out.
	echo($teat);
}