《新唐书·本纪·卷七·德宗 顺宗 宪》
贞元元年正月初一，施行大赦，更改年号。
贞元元年正月丁酉，大赦，改元。
On the first day of the first month of the first year of Zhenyuan, a general amnesty was implemented and the name of the year was changed.
<s>[INST] Kindly elucidate the central themes in this passage in English: 贞元元年正月丁酉，大赦，改元。 [/INST] On the first day of the first month of the first year of Zhenyuan, a general amnesty was implemented and the name of the year was changed.</s>
Kindly elucidate the central themes in this passage in English: 贞元元年正月丁酉，大赦，改元。
user
On the first day of the first month of the first year of Zhenyuan, a general amnesty was implemented and the name of the year was changed.
assistant