She looked at the calendar on the box. Was there a calendar in ancient times?

Yes, but it's usually not called a calendar, but an "imperial calendar".

Six ancient calendars used in China before the Western Han Dynasty. Namely Huangdi calendar, Zhuan Xu calendar, Xia calendar, Yin calendar, Zhou calendar and Lu calendar. Legend has it that the calendar created by the Yellow Emperor is the oldest. Lu, a poet in the Tang Dynasty, wrote "The Seal of Chinese Harmony Songs": "The Yellow Calendar is the abbreviation of the Yellow Emperor Calendar, so people are used to calling it the Yellow Calendar.

Later, the yellow calendar is often mixed with many contents that promote auspiciousness and taboo, and the superstitious color is very strong, so the yellow calendar has become the name of the old calendar book. Emperors of past dynasties attached great importance to calendars. At the beginning of the 9th century, the Tang Dynasty ordered. Almanac must be approved by the emperor himself before it can be promulgated, and it is stipulated that only official seals are allowed, and private seals are not allowed. Since then, the almanac has become an "imperial calendar". As for the word "imperial calendar", it is said that it is related to Song Taizong. At the end of each year, Song Taizong sends an almanac to Wu Wenbaifu. This almanac is engraved with Chinese Lunar Festival and common sense of agricultural planting. Because the almanac was given by the emperor, it is called "imperial almanac".