timestamping (Wikipedia)
A postmark on a letter, with a timestamp showing the date (center) and time the letter was received by the post office.
German date and time stamp, a rubber stamp that stamps the current date and time on a document, 1960s
Advertisement for a 1915 Kodak Autographic camera. The picture shows a photographer writing directly onto the film inside the camera. He may have been recording the date of the photograph that he had just taken.

A timestamp is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day, sometimes accurate to a small fraction of a second. The term derives from rubber stamps used in offices to stamp the current date, and sometimes time, in ink on paper documents, to record when the document was received. Common examples of this type of timestamp are a postmark on a letter or the "in" and "out" times on a time card.

In modern times usage of the term has expanded to refer to digital date and time information attached to digital data. For example, computer files contain timestamps that tell when the file was last modified, and digital cameras add timestamps to the pictures they take, recording the date and time the picture was taken.

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