What does "timestamp" mean?

A variable containing the date and time at which an event occurred, often included in a log to track the sequence of events.

How do you pronounce "timestamp"?

Pronounced //ˈtaɪmˌstæmp//.

Common synonyms include: calendar dating, chronicle, clock gear action, current time value, date, date and time mark.

/ˈtaɪmˌstæmp/ noun, verb

noun, verb ·Uncommon ·Advanced level

Noun

1
A variable containing the date and time at which an event occurred, often included in a log to track the sequence of events. especially
2
The time at which something in a video occurs. Internet

Verb

"But I saw some newer ones without a timestamp, too."

From time + stamp (noun); the verb sense derives from the noun.