calendar

/ˈkæləndər/

a system of timekeeping that defines the beginning and length and divisions of the year

Chinese meaning: 日历；历法

The Gregorian calendar is the most widely used civil calendar in the world.

公历是世界上使用最广泛的民用历法。

She marked the deadline on her calendar to avoid missing the submission date.

她在日历上标出了截止日期，以免错过提交时间。