Smart dating system
Note that this system is not generally used by Imperial citizens in everyday life, but is simply for administrative use by the Adeptus Terra.This is the year within the millennium, running from 001-999. 2018 would be represented very generally in the Imperial Dating System as 018. As almost all records of the religions practiced by Mankind before the development of the Imperial Cult in the 31st Millennium have been lost, none know exactly why the Imperial Calendar counts the years in this manner or the true origin of the dating system.The task of compiling a full and accurate accounting of the history of humanity was a monumental and nigh-impossible task, compounded further by the fact that even the Imperial Dating System was woefully inaccurate.As the Primarch digested thousands of standard years of history recorded upon every device conceivably employed by Mankind, he had come to learn of the Chronostrife of Terra, a bitter, ongoing internal war within the Ordo Chronos over the Imperium's dating system. Not even his father's calendar had survived the millennia intact.Most importantly, the years are always "Anno Domini" (AD) using the numbering system of our own present-day Gregorian Calendar, so the dates themselves are the ones that we are familiar with now.A typical date as Imperial scholars write it would look something like 0.123.456. This date can be divided up so that each part is explained separately below: 0 123 456 M41 = Check Number/Year Fraction/Year/Millennium Following the birth of the Great Rift, temporal anomalies spread across the galaxy making the use of a universal dating system extremely difficult as different Imperial worlds began to experience the passage of time at different subjective rates.
It used the birth of the Great Rift as the standard event from which all time was calculated, either before or after its creation.The problem faced by Guilliman was that after the opening of the Great Rift, near every active Imperial war zone had to devise and reinforce its own chronological system.Even had the Imperium of Man not been split in half, the sheer interstellar distances it covered prohibited any accurate reflection of time and space.Even as he made war, the Primarch attempted to grasp the events of the ten millennia that had passed since he had fallen during the Battle of Thessala to the Daemon Primarch Fulgrim.He was dismayed to find that much of humanity's history had fallen afoul of superstition, fanaticism and hearsay during his absence.