Gone are the days where you had the daunting task of writing the date on an open container in your refrigerator and then being forced to conjure up the current date and calculate the difference between then and now. The DaysAgo Digital Day Counter now counts the days for you to end all question about just how old that casserole is.

The DayAgo counter can stick onto something either with a magnet or a suction cup and counts up to 99 days. Once it’s done it can be removed and reused on something else by resetting the counter and sticking it on. At a glance you can then see if your opened items or left-overs have been “in there” for a couple days or a couple weeks.

The DaysAgo website shows many examples that actually seem pretty practical, from measuring time that foods in the fridge to when plants were last watered or when meds were last taken. It uses a small disc-type battery that can be replaced after an expected 18 months of use. You can get yourself a 2-pack (either suction or magnet backing) for $10.