This is the zero based version.
If you like the looks of that, this (very) small and simple modification is for you! I made it for myself because I found the games silly "year" far less important than the actual turn.
Special thanks to homegrown for showing me the appropriate functions.
As a small other change I made, this mod removes(well, sets to 99) the 6 citizens restriction from the city screen. The downside to this is it will flood over to the main screen, but as you will rarely have more than 10 or so specialists, this isn't a real problem. What it is primarily for is for that annoying 7th or 8th special citizen, which causes no real problems with the city screen. This change is easy to undo if you do not like it, as it is near the top of the file. Neither of these changes result in any type of concrete gameplay change, and therefore does not affect balance or constitute cheating.
Just unzip it into your mods directory, load it and go.