View Full Version : Imperial Calander

Cripple X
12-09-2007, 00:18
I'm in the process of reading the wonderful fluff on the Siege of Vraks in IA5 and a lot of dates keep coming up. How exactly does one read them? For Instance: 166813.M41. Obviously M41 is the 41st Melinnium, but what do the other numbers represent?

Do the numbers in some way correspond to the Gregorian (sp?) Calander, has GW made up some sort of date conventions, or are they simply numbers strung together to look neat?

12-09-2007, 00:45
I usually write dates like this, it's a little bit more clearer: 166.813/M41, but that's just for convenience.

Anyway, 813 is the year, 166 is the year segment or year fraction.
The years are normal Terran (Earth) years, but for administrative purposes the year is broken into 1000 equal parts; 001-000.

Each Earth day would therefor be about 2.7 year segments. So year segment 166 would half way through the 61st day of our year, also known as 30 February. (If my calculations are correct anyway)

Usually there's another number in front of the year segment, which indicates how accurate the date is. 0 or 1 being most accurate, 8 being the least accurate. 9 is an approximate date, for example used when converting a Xenos date to an Imperial date.

Here (http://wh40k.lexicanum.com/wiki/Imperial_Dating_System) is a link to an article that deals with it perhaps a little more clear.. If you can get your hands on a 3rd edition rulebook, it has an even more detailed description of the Imperial Dating System in the back of the book. (EDIT: Here (http://www.gamehobby.net/subject_indexes/subject_wh40k_chapter_approved.html) is another link I found which, i think, includes all the info from the 3rd ed. rule book. Scroll down to WD 97.)

Lord Cook
12-09-2007, 01:10
I got the impression the first number is just the day, based on a standard Terra year (which we know to be 365.25 days). So the date 231.998/M41 would be the 231st day (the 19th of August) of the year 998 of the 41st millenium (so the year 40,998). I've never seen the first number be higher than 365 before.

Having read your links, I notice it says the 1000 method isn't generally used by imperial citizens, and is just for administrative purposes. Whether this means there's both an official and a popular way of doing things I don't know, or maybe I'm just completely mistaken.

12-09-2007, 02:59
Here's another link (http://www.scholaprogenium.com/calendar.html) for how to properly read the Imperial calendar...

Enjoy :D

Cripple X
12-09-2007, 14:07
That's awesome! Thanks so much for your explanation guys! I'm pretty new to the hobby so I never had a chance to check out the 3rd edition rulebook. It's pretty odd they wouldn't include that information in the 4th Edition rulebook as well.

Lord Cook
12-09-2007, 17:12
I stand corrected.