This is actually an interesting question. How is age handled in a space-age civilization? Someone born on one planet could be 10 while on a different planet they'd be 50 in the same timeframe. What if you spend part of your life on one and the rest on another? It'd be inconvenient to use one planet's 'day' as the standard, as they'd all be different lengths...
You could pick a neutral thing and then denote that as the galactic 'clock'. We do it as humans to an extent. We use Pulsars to measure distance and time because of the extremely precise rotation times.
Either that, or we'd just use UTC, still. Like on the ISS or Mars. Bet you computers in that timeframe would be hard built on earth's and society's system.