Ahldoraean century, abbreviated as AC, is a hundred years on planet Ahldorae. It is a longer period of time as compared to Gearth due to a higher orbit around its star. The year on Ahldorae takes up 383 days. The length of the day, however, is almost identical to a normal Gearth day.

There are different forms of noting the date. One can write 6th AC, which would mean 6th Ahldorean century. A particular year can also be written like so: 956 AC, to differentiate Ahldoraean years from Gearth years.

Ancient dantrian philosophy speaks of history revolving along a spiral, with each spiral revolution taking 2000 years. Therefore, they count revolutions and restart the year count. Current date us 11th century 3rd revolution. Dates prior to 0 century AC are 200, 199, 198 of 2nd revolution.