I regret many things and this blog is one of them.

Since the game never specifies what kind of Martian calendar IMC is, I used the one with the most information on it on Wikipedia, called the Darian Calendar. It assumes 24 months of either 28 or 27 sols (Martian days), and I used the "default" leap day of the last sol of the last month happening approx 6 times out of 10 years. Personally I enjoy the Utopian naming system best, but all this calculator does is give you numbers. Naming the 24 months is up to y'all.

The Darian Calendar specifically places the "New Year" on the Martian vernal (spring) equinox, so keep that in mind if that's important for your writing/whatever you're using this for.

For those of you in the know about the Julian Dates system, yes, the EIC inputs do correct for the months of January and February, so don't worry about it.

Due to an assumption I had to make about the leap year formula for Mars, this converter technically only works 100% correctly through 24/27/2000 IMC (12/19/3764 EIC). After that, due to how Mars is slowly becoming more elliptical over time, a new leap year formula would be needed, along with a new length of year conversion, since the year would become 0.0013 times longer with the new leap year correction. The specifics are on the previously linked wikipedia page.