Because there never was a year 0. Actually since the calendars are such a messy affair today could be, in fact, 16 December 2015.
http://www.theregister.co.uk/2009/12...f_days_decade/
EDIT: The thing RTW -or rather its [modified] engine- has got going for it is: http://en.wikipedia.org/wiki/Time_Commanders
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