Ok i've worked out a time system. The leapdays are complicated, but don't complain unless you've tried it yourself; it's harder than it looks.
Second: 0.729425 S.I. Seconds
Hectosec(ond): 100 Seconds; 72.9425 S.I Seconds
Dekil(osecond): 1e4 Seconds; 2 Hours, 1 Minute, 34.25 S.I. Seconds
Day: 1e5 Seconds; 729425 S.I. Seconds, 0.84424189148148... S.I. Days
Division: Monosia, Disia, Trisia, Tetrasia, Pentasia, Hexasia, Heptasia, Octosia; with 51, 51, 50, 50, 50, 50, 50, 50 days respectively
Year: 402.460999966 Days; 40246099.996572 Seconds
Year zero starts at Epoch. Years before have a - sign: -2,-1,0,1,2, etc.
Rules: Leapdays are always added on to end of Octosia, happening on average every 0.460999966 years. A Leapyear happens every even numbered year, except those divisible by 26, 1858, or 23990. Every 303951 years, a day is taken off of the end of Octosia. This allows for a time change of less than a Dekasecond for up to several billion years.
Epoch: UTC 00:00:00 January 4, 2012 (S.I. 1325635224 seconds from UTC epoch)