Interstate Battery System International Inc. manufactures vehicle and other types of batteries. All Interstate batteries are stamped with a coded date, which Interstate refers to as the shipping date. Interstate distribution centers also put another date on the batteries because batteries get recharged if they remain in stock for more than three months. Finding the manufacture date on Interstate batteries is a fairly straightforward task, as long as you know what the codes mean.
Look down at the top of your Interstate battery to find the manufacture date code. You can only see the code from directly above the battery.