https://www.glyphweb.com/arda/s/stewardsreckoning.html
This link has the calendar details. I think I might have found the FG mod under D&D calendars, but now I can't find it to see if there are other options. The shire calendar isn't useful or to be correct confusing for a ME campaign since it is only relevant to a very small portion of ME and only if you have a party of hobbits.