**Klingon date to Earth date**

10 Easy Steps

- Choosing either the leap year calendar or regular calendar to the right, determine how many Klingon days have already past that year.
- To that number, add 1/5 of a day for each year after the nearest previous leap year.
- 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.
- Add the Klingon year number to your resulting decimal.
- Multiply by 1.0002139.
- Add 1374.0611327.
- Subtract the resulting Earth year, leaving just the decimal.
- Multiply by the total number of days in that Earth year, weather leap or regular.
- Subtract 1/4 of a day for each year after the nearest previous leap year.
- 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

- Choosing either the leap year calendar or regular calendar to the right, determine how many Earth days have past that year.
- To that number, add 1/4 of a day for each year after the nearest previous leap year.
- Divide that number by the total number of days in that Earth year.
- Add the Earth year number to your resulting decimal.
- Subtract 1374.0611327.
- Multiply by .9997862.
- Subtract the resulting Klingon year, leaving just the decimal.
- Multiply by the total number of days in that Klingon year, weather 433 for years divisible by 5, or 432 for non-leap years.
- Subtract 1/5 of a day from your resulting number for each year after the nearest previous leap year.
- 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."

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.

**Klingon Time Period lengths (for normal calendar years)**

1 lup- 1.98 seconds

1 tup (48 lup)- 1.58 minutes (95.09 seconds)

1 rep (48 tup)- 1.27 hours (76.07 minutes)

1 jaj (16 rep)- .85 days (20.29 hours)

1 Hogh (8 jaj)- .97 weeks (6.76 days)

1 jar (6 Hogh)- 1.35 "months" (40.57 days)

1 DIS (9 jar)- 1 "year" (365.15 days)

**Factoids**

- The Klingon calendar began on January 22, 1375 at 3:23:46 PM UTC, Gregorian Calendar.
- Qo'noS revolves around its' sun every 432.2007378 days
- That would amount to an extra unaccounted for 3 "hours", 10 "minutes", and 8 "seconds" per Klingon year.
- They account for this by adding one "day" at the start of any year divisible by 5.
- This is not an exact fix, but is close enough for a period of several thousand years.
- Earth revolves around its' sun every 365.2425 days.
- A Klingon orbital year is 1.000213895499 Earth orbital years long.
- An Earth orbital year is .999786150243 Klingon orbital years long.
- 1 Klingon "second" (lup) is exactly 1.981070685 Earth seconds long.
- There are exactly 15,932,648 lup in a Klingon orbital year.
- There are exactly 31,563,701.89 Earth seconds in a Klingon orbital year.
- There are exactly 365.320623726852 days in a Klingon orbital year.
- The Klingon day runs from sunrise to sunrise.