noun
creation date and time; timestamp
Computing term for the date and time when a file, record, or data entry was created.
ファイルの作成日時を確認する。
Check the file's creation date and time.
このデータの作成日時は先週の金曜日になっている。
The creation timestamp for this data is last Friday.
更新日時 refers to the last modification date and time, while 作成日時 is specifically the original creation timestamp.
Compound of 作成 (creation) + 日時 (date and time).