Setting time across the stars is no easy feat. Back in the days of the First Landing the time scale used was one that humanity inherited from their progenitors. Each hour (equivalent to a cycle), had 60 minutes separated into 60 seconds and 24 hours made a day and each month had anything between 28 to 31 days that in total of between 365 and 367 made a year.   Scientists, long speculated that this was related to some sort of a religious ritual or a suboptimal system that was trying to account for the rotation of a planet around itsself and its star. Although this is unfounded and no planet-star combination in the known universe can account for this, the Cult of Helios is still using this system to this day.  

A pulsar centric system

1 Arc = 1 pulse of the T1 Pulsar also known as the Lighthouse (1 Second)