"Han" Corrections Calendar Days

Most history books have calendar dates corruptions in varying degrees. Especially,<Hou han shu>is given bad review for its numerous corruptions, and some previous scholars only do a little research on these corruptions. Contemporary scholars’research is also of the sporadic characteristic, the system is not strong, some conclusions are also questionable.The reason result in corruptions in history books is varied, and present research can be affected by the existing documents, because the uniqueness of historical documents is difficult to replace its accuracy. Meanwhile, because of different material used by the historians and their different material processing methods, it is also need to be careful on choosing material. Ancient calendar is the main proof on studying calendar dates corruptions. The calculation and evolution of four points calendar in eastern Han dynasty calendar are recorded in detail in "lvli Treatise", historian circle also do more deep research on it. Therefore, this article attempts to systematically and thoroughly correct calendar dates corruptions, and make reasonable conclusion and inferences on the original calendar and reasons lead to calendar dates corruptions in<Hou han shu> by checking and proving the calendar dates of revised<Hou han shu>. For lack of historical data or both historical accounts are close to calendar dates, it is difficult to make right choices, so the different accounts of history are kept in order to do further study.