calendar

I marked the date of our graduation ceremony on the wall calendar.

(Chinese) 我在墙历上标出了我们毕业典礼的日期。

According to the solar calendar, February has 28 or 29 days.

(Chinese) 根据公历，二月有28天或29天。

The lunar calendar is used to determine the dates of traditional festivals.

(Chinese) 农历被用来确定传统节日的日期。

The ancient Mayan calendar was remarkably accurate in its astronomical predictions.

(Chinese) 古代玛雅历法在天文预测方面非常准确。