Convert Gregorian date to D'ni

Gregorian date (Cavern Time, UTC-0700)
:
D'ni date
Time is listed in gartahvotee:tahvotee:gorahntee:prorahntee.
For more information about D'ni time, see this Guild of Archivists article.

Convert D'ni date to Gregorian

D'ni date
:
:
:
Gregorian date

Notes

Accuracy

This date converter is not necessarily accurate to the second/prorahn, as it does not account for leap seconds in the modern Gregorian calendar.

The distant past

This converter outputs Gregorian dates under all circumstances. However, the Gregorian calendar was only officially adopted for the first time in 1582, and its adoption was staggered throughout the world, with some countries not adopting it until the early 20th century. As such, be cautious when using this converter to "line up" an historical event with something that happened in the Cavern. Entering Julian calendar dates for ancient history will not provide the correct D'ni date, and you will receive Proleptic Gregorian dates when converting the D'ni date for almost any event that took place before Myst.


Implementation by @alahmnat. Based on work by RIUM+, Jehon the Scribe, and rokama. Additional contributions by Brett Middleton.
More information is available here.