[1] Chinese Text Project, Donald Sturgeon, 5/3/2023, 3:21:04 AM, 5/3/2023, 3:21:42 AM https://ctext.org/
The Chinese Text Project is an online open-access digital library that makes pre-modern Chinese texts available to readers and researchers all around the world.
[2] 関連: 中国古代の日時, 朝鮮半島の即位紀年
Google search: Chinese Text Project