'time keeper' is correct and usable in written English
You can use it to refer to a person who is responsible for keeping track of time in a particular situation. For example, "The teacher appointed me as the time keeper for the class debate."
The time keeper calculates and stores timings for the tasks and the transfers when necessary for the ABC.
He wants to face off with the president in seven three-hour Lincoln-Douglas-type debates, "with a time keeper but no moderator".
At a signal from the time keeper, the other lad clutched his stomach & began squealing loudly, at another signal he stopped.
Mr. Suchodolski was also a high school football referee for nearly 50 years, serving as time keeper when old age prevented him from taking a more active role in officiating.
An unwittingly humorous account of the establishment of Rag, a feminist journal at Harvard, reported that the founders "proposed a method of consensus for decision-making and suggested that the positions of facilitator, time keeper and vibes watcher (whose job it was to monitor the tension in the room and notice if people were being silenced) should rotate on a voluntary basis".
A timed PowerPoint presentation displayed the instructions and served as time keeper for the test to ensure equality of treatment among the subjects in the various classes.
It's really more of a surprise that he doesn't have a dedicated full-time keeper of the royal cushion.
(One senior technician, having cared for animals at King's during the week, works as a part-time keeper at London zoo at weekends).
And then they'd dance Cape Clear sets, two opposite two, and do slides, a young man squeezing the box for all he was worth away out there in the middle of the sea .Back to lonelinessElectricity came in 1969, and 20 years later the last full-time keeper left.
An Arsenal goal looked likely but, in a Birmingham breakaway three minutes before half-time, keeper Emma Byrne had to make a fine save from Aluko's angled shot.
Well, no… in addition to being an elder my father was time-keeper in a shipyard.
