date stamp

US: (dāt′stamp′)

WordReference Random House Unabridged Dictionary of American English © 2025

date′ stamp′, 

1. a device for stamping dates and frequently the place of origin or receipt, as on postal matter.
2. the information stamped by this device.
• 1855–60

date-stamp  (dāt′stamp′), v.t. 

1. to stamp the date on, as with a date stamp:
   He date-stamped every letter received.

• 1925–30

Collins Concise English Dictionary © HarperCollins Publishers::

date stamp noun

1. an adjustable rubber stamp for recording the date
2. an inked impression made by this

verb date-stamp

(transitive) to mark (an object) with an inked impression of a date