What is "calendars"

Usage examples of "calendars".

But he was so young, barely a man, only eighteen years old according to the calendars of this world.

This fort, the old Dariyan fort built by order of Arki-kai Tangashuan seven hundred years ago, reckoning by the calendars she knew.

The wall was festooned with mechanics' calendars of women bending over to show their bosoms and thrusting out their pelvises.