Time is a hard one to break down unless it is referred to terms in which the unit of time is measured by (example: seconds, minutes, hours, days, weeks, months, seasons, years would have their own term) Or planetary time is different in length of day. But due to prevention of mass confusion of all subspecies came to an unspoken agreement that time was universal and was measured the same as it is today as players know when the time pieces (clocks or devises that measured time) came into existance and the developement of time zones on planets. Ships had their own time zone which they ran off.
Military and Civilian ship time is the same, yet the block of time to measure day, work, wake time / Night, sleep, relaxation was equal in hours. Thus came about and broken down in shifts, blocks of time per shift for the crew to work, relax, sleep in cycles so that the ship was under watch constantly. Yet gave the crews a sence of passage of time
A typical day aboard a ship constist of 3 to 4 shifts of a block of equal time for each shift making for a typical rotational day.
Time is still measuered by seconds, minutes, hours, etc.... universal of all subspecies.
I hope this made sence....