See Calendar.

List of calendars

(including some dating systems which are not really calendars)

In current use

• 53-week calendar
• Bahai calendar
• Buddhist calendar
• Chinese calendar
• Coptic calendar
• Discordian calendar
• Ethiopian calendar
• Fiscal year
• Gregorian calendar
• Hebrew calendar
• Hindu calendars
• Iranian calendar
• Irish calendar
• Islamic calendar
• ISO Week-Date calendar
• Revised Julian calendar
• Japanese calendar
• Julian calendar
• Malayalam calendar
• Metonic calendar
• Thai solar calendar
• Zoroastrian calendar (including Parsi)

Obsolete

• Aztec calendar
• Babylonian calendar
• Egyptian calendar
• French Revolutionary calendar
• Germanic calendar
• Hellenic calendar
• Maya calendar
• Positivist calendar
• Roman calendar
• Runic calendar
• Soviet revolutionary calendar
• Thai lunar calendar

Proposed

• Darian calendar for use on Mars, the four Galilean moons of Jupiter, and Titan.
• Calendar reforms:
  • Common-Civil-Calendar-and-Time
  • International Fixed Calendar (also called the International Perpetual calendar)
  • Symmetry454
  • World calendar

Fictional

• Discworld calendar
• Middle-earth calendar
• Stardates (Star Trek)