Is it ten years or twelve years?

1, used in time, ten days is ten days (a month is divided into thirty days), that is, 10 days.

2, used in age, ten years old is ten years, which is what you said "10 year".

Every month, there are three days from a to decimal. For the convenience of timing, January is divided into three equal units, and one unit is ten days, which is called ten days. From the first day to the tenth day, or from the first day to the tenth day, it is ten days. Ten days later, another ten days, thirty days a month.

Extended data

In China, people still use ten days to represent ten days. The first ten days of a month are early, the last ten days are China and Japan, and the last ten days and the remaining days are late days. In ancient China, heavenly stems and auspicious days were repeated every ten days, so a word "ten days" was used to express this concept.

Xunzi (Pinyin: xún) is a first-class Chinese character (commonly used word) in the General Standard of Chinese. . This word first appeared in Oracle Bone Inscriptions in Shang Dynasty, and it refers to things. Oracle Bone Inscriptions from ten (or one) up, down like a ring. It means that the 10-day cycle from one day to one day of deck is "10 days". Jin Wen Jia Riming did say that the ten-day cycle is "ten days". Later, it turned to ten years, and it was extended to a complete time period.