Simple past tense and past participle of time-stamp.(verb)
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Use "time-stamped" in a sentence
"ICurfew lets kids use their iPhone to send parents a time-stamped report -- that can't be edited -- identifying their location."
"The mix also serves as a great example of how useful SoundCloud's time-stamped commenting function is, with notes posted by listeners throughout the mix, swapping info on its individual tracks."
"Perhaps the prompt and the reply would be recorded, time-stamped, in a log file."