I've noticed that only one of the ships clocks work and show correct time, and thats the one in the sonar station, may be one other at another location but I dont remember right now.
All the other are stuck at 12:00 and never move off that.
Somebody go back to port and bring back a crapload of clock batteries will ya?

But yes one can always bring up the stopwatch/clock, but it's nice to just swing around and look up at the ships clock and see at a glance.
This was one of the first things I noticed while exploring the ship on the first mission.