This is the 13557th most frequent German word.
datieren
"Datieren" means "to date" or "to assign a date to something."
Here, the verb 'datieren' is used to denote determining the age of an artifact or discovery.
Die Geologen datieren den Fund auf das Jahr 1000 v. Chr.
The geologists date the find to the year 1000 BC.
In this sentence, 'datieren' refers to the act of marking a document with a specific date indicating when it was written or processed.
Er bat mich, den Brief zu datieren, bevor ich ihn absende.
He asked me to date the letter before I send it.
The term 'datieren' here implies the process of attributing a current date or marking a document with the date it becomes effective.