Abstract: A new calendar that has separate sets of plates that bear the symbols representing the information. For example, one set of plates bears the names of the months of the year (or abbreviations of those names), another set of plates bears numerical dates, and another set of plates bears an indicator of the days of the week. The plates are arranged in a stack, with at least some of the plates covering the symbols on underlying plates. Separate, axially offset hinges enable selected plates to be rotated with respect to other plates, revealing the symbols on the selected plates while the symbols on other plates remain covered. The hinges enable a user to rotate the stack to a position where a selected plate in an upper set of plates is exposed while any overlying plates remain positioned behind a top cover plate and any underlying plates in the upper set of plates remain positioned behind the exposed plate.