Calendars for Use

In use around the World current and past

• Gregorian
• Julian
• Jewish
• Various Lunar calendars

Out of this world

• Mars - challenge day length and year are different from Earth

From fiction

From Books and Film there are a number of different calendars I've encountered and decided would be fun to use. Some are widespread among fans while others may not be as well known

• Stardate from StarTrek
• Shire calendar from Tolkein Lord of the Rings Series