Book excerpt: The 300 Year Calendar Book will solve these problems fast. Indeed, using this book one could very easily and quickly find any day of the week in the years between 1760 to 2060. Furthermore, if one remembers the constant number of any given month of any year one could determine the day of the week instantly by application of the Koay Calendar Formula. This is the intention of this book. It saves one’s time, reduces one’s frustration and helps to keep one’s blood pressure normal.