What do you mean by "Taihe N years" and "Daye N years" in history?

Taihe and Daye are the titles of emperors.

The year number is the product of China's ancient original invention. Besides dating, it also means praying, praising and changing dynasties.

Our time in China is the lunar calendar, and then the calendar uses the emperor's year number.

Some people, such as Li Shimin, are Emperor Taizong, but his title is Zhenguan. So history is ruled by Zhenguan. Some emperors have only one title in their life, Li Shimin has only one title, and his son Li Zhi has several titles. What is a dragon's back and what is virtue, most of them are based on that kind of prayer to get a good impression or depending on the situation of the year.

Chongzhen, Apocalypse and Wanli in Ming Dynasty are all year numbers.