timekeeper
nounUK /ˈtaɪmkiːpə/
US /ˈtaɪmkiːpər/
A timekeeper is a person who makes sure everyone knows the time and that things happen on schedule.
The timekeeper blew the whistle when the game was over.
OTHER MEANINGS
2. A person or device that records how long something takes, such as in a race.
The official timekeeper recorded her finishing time as 12.4 seconds.
3. A person who keeps track of employees' working hours.
The factory timekeeper noted who arrived late each morning.
4. A watch or clock, especially one that keeps accurate time.
This old clock is a reliable timekeeper.