timeserver

noun4

1. •
   A device, node or program that transmits the correct time to clients in a network.
2. •
   A person who conforms to current opinions, especially for reasons of personal advantage; an opportunist.

   • Another of Lilly's confidants was the time-server, John Gauden, who was distinctly anti-Laudian in outlook, but who nevertheless became Bishop of Worcester at the Restoration. — 1971
3. •
   Someone who performs a job for the required time only, making a minimum of effort.
4. •
   (no longer used) Someone who honors their commitments only when it is personally easy to do so.