If it's not a Sports Illustrated Swimsuit Calendar, Why buy a calendar every year when you can make use of just one, no matter what year it is? The inventive Perpetual Calendar lets you do that. Whether it's 2013, 2014, 2015, or 2050, you won't have to purchase another calendar again as the Perpetual Calendar is, well, perpetual. All you have to do is to move the two magnetic balls to mark the date and month. This unique calendar can be mounted on a wall or placed on a desktop. You won't even need to shell out a lot of cash for this eternally useful product.