After the turbulent times of the first two Fredericks, the six decades under the rule of King Deutsch saw not only the final end to the revolution and the complete unification of all German city states under one banner, but also an unprecedented rise in scientific achievement. Years of tedious record keeping and watching of the stars' movement led to the discovery that it takes exactly 365 days until constellations repeat themselves fully, or in other words until the entire universe has completely revolved around our world. Unfortunately it wasn't before the last year of the monarch's life until a comprehensive calendar down to every day of the week could be created and spread among the land. The last royal decree by the late ruler was to share this knowledge with all the world's peoples, but it took well into the reign of his successor Frederick III till this goal could be accomplished, and even then some nations needed to be introduced to basic concepts of mathematics itself before they could be taught this new system of time keeping.
The first act of King Frederick III was to decree that the first year of his rule should be known as 1 After Deutsch, or 1 AD, with every year before that point henceforth being referred to as Before Calendar, or BC. The new calendar quickly caught on and replaced the old local systems that have been in use within decades, as Deutsch was widely being recognized as the best ruler the German people has ever had. Indeed it wasn't long until the German people began referring to itself as Deutsch in its own language. Things are looking up with the only exception being the expansionist drive of our Russian neighbors.