Klingon Calendar Conversion Steps


Klingon date to Earth date
10 Easy Steps

  1. Choosing either the leap year calendar or regular calendar to the right, determine how many Klingon days have already past that year.
  2. To that number, add 1/5 of a day for each year after the nearest previous leap year.
  3. Divide that number by the total number of days in that Klingon year, 432 for any year not divisible by 5, and 433 for leap years.
  4. Add the Klingon year number to your resulting decimal.
  5. Multiply by 1.0002139.
  6. Add 1374.1722897
  7. Subtract the resulting Earth year, leaving just the decimal.
  8. Multiply by the total number of days in that Earth year, weather leap or regular.
  9. Subtract 1/4 of a day for each year after the nearest previous leap year.
  10. Choose correct calendar, and using your number determine what exact day of the Earth year it is.

That exact time will be the start of that Klingon "day", which will proceed for approximately the next 20 hours.


Earth date to Klingon date
10 Easy Steps

  1. Choosing either the leap year calendar or regular calendar to the right, determine how many Earth days have past that year.
  2. To that number, add 1/4 of a day for each year after the nearest previous leap year.
  3. Divide that number by the total number of days in that Earth year.
  4. Add the Earth year number to your resulting decimal.
  5. Subtract 1374.1722897
  6. Multiply by .9997862.
  7. Subtract the resulting Klingon year, leaving just the decimal.
  8. Multiply by the total number of days in that Klingon year, weather 433 for years divisible by 5, or 432 for non-leap years.
  9. Subtract 1/5 of a day from your resulting number for each year after the nearest previous leap year.
  10. Choose correct calendar, and using your number determine what exact day of the Klingon year it is.

That exact time will be the start of that Earth day, which will proceed for approximately the next 1.2 Klingon "days."


My chronological confidante Timon has generated a spreadsheet that converts several Treklit alien calendars to stardates and earth dates.  It can be accessed on this page.  He was kind enough to add my modified version of the Kenson-Bennett Klingon calendar to his spreadsheet. 

NOTE: My attempt to account for leap days isn't 100% accurate, but this should arrive at a conversion within a reasonable margin of error. In addition, these estimated exact times do line up with the DTI's preferred Earth time zone, UTC.


If anyone could offer their aid in building a calculator program that would allow these steps to be done automatically, please contact me at ryan123450@yahoo.com. 

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