To keep time is to tell time using a clock or other time-keeping device. You might use a clock to tell time when you're playing a game, or you might use a clock to tell time when you're working.
The clock on the wall told them that it was 2:00 pm.
The clock on the wall told them that it was 9:00 am.
noun
the act or process of determining the time
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He is the biographer of Rupert Gould, the restorer of the Harrison timekeepers.
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His office was that of timekeeping.
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The ching are the timekeepers of the ensemble.
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The state of the art in timekeeping.
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The state of the art in timekeeping.
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They are assisted by a timekeeper and a scorekeeper.
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History of timekeeping devices in Egypt.
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QZSS timekeeping and remote synchronization.
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Nels Neilson was the timekeeper for the job.
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This way, a dedicated timekeeper is not required.