You are incorrect because the solution to leap years is approximate - we'll need to actually remove leap days on years that are multiples of 3200 and that won't

You are incorrect because the solution to leap years is approximate - we'll need to actually remove leap days on years that are multiples of 3200 and that won't even make things perfect. Time is more complicated than you assume - and if you program this yourself be prepared to also get messed up by leap seconds which are used to account for earth's rotation varying over time.