This cross platform - Linux, Mac OS X and Windows - F# .Net library and program converts Maya Tzolk’in dates to Gregorian dates and vice versa.
If you want to know more about the Maya calendar systems, see Links.
Information about the smartphone app is at Usage of the Smartphone App
A video of the smart-phone app is at YouTube.
Information about the usage of the F# NuGet library Tzolkin you find at NuGet Package.
To interactively try out the F# NuGet package Tzolkin, go to the Jupyter Notebook at
Contributing has information about how to contribute to Tzolkin, by
filing bug reports or feature requests, to contributing source code, to adding documentation
or translations or any other way you can help Tzolkin.
Smithsonian Museo Nacional del Indígena Americano: Viviendo El Tiempo Maya
Website of the Smithsonian National Museum of the American Indian on Mayas Living Maya Time.
Online general Maya (not only Tzolk’in) calendar converter: Maya Converter of the Smithsonian NMAI