The best way to do it is to nuke it for 10 seconds,check to see what the temp is and if its in the upper 90's stick it in your underwear between your legs. It'll stay at temp for a couple hours that way. If its a little to warm when you do the test just pour it in the cup and blow on it till the temp is down. It cools down fairly quickly. If you screw up and its too cool,rub your thumb agains your clothes briskly and hold it against the temp strip for a few seconds till you get the temp just right.
The QF I buy doesn't have a date stamp on it.