Humans of this planet do not have the standard time system present here on earth. The sky is always cloudy (thus never seeing stars) and the light amount doesn't change much. They tell time and years by the cold and hot times when the planet nears itself the sun or goes away from it. Thus coming up with this:

100 seconds = 1 minute
100 minutes = 1 hour
100 hours     = 1 day
256 days       = 1 year

Each new year starts in the middle of the warm times when the planet is closest to the sun.