Calendar Facts


Happy new year!  Did you ever wonder how January 1 became the day when one year ends and another begins?  Or why this handoff from one year to the next takes place a few weeks after the shortest day of the year?  Why are there 12 months instead of, say, 25 or 50?

We have just entered the 432nd year of what is known as the Gregorian calendar, which was introduced by Pope Gregory XIII in the 1600s but was only adopted in England in 1752.  The new calendar replaced the Julian calendar, which, on introduction in 46 B.C., corrected problems with the previous calendar system by creating an initial calendar year with 445 days–what later became known as the “year of confusion.”  Before that, the Egyptian calendar—the original prototype of our current calendar system–was invented as a way to track the annual rising of the Nile River, which was critical to Egyptian agriculture.

The common thread of these calendars—and the Mayan, Chinese and Greek calendars–is that they are based on the fact that the moon goes through 12 cycles of full to new each year, which is where the idea of 12 months (“moons”) came from.  Alas, the Gregorian calendar preserved some of the quirks of the Julian calendar: as you know, the months are of different lengths, holidays fall on different days of the week from year to year and there is the messy necessity to include an extra day each leap year.  The new calendar did manage to preserve the 7-day week, which facilitated the observation of the Sabbath every seventh day—virtually a requirement for any calendar that would be adopted in the West.

You might be surprised at the number of proposed “new and improved” calendars that have emerged over the years.  The Raventos Symmetrical Perpetual Calendar and Colligan’s Pac calendar both feature 13 months of 28 days each, while the Symmetry 454 Calendar eliminates the possibility of having the 13th day of any month fall on a Friday.  Eastman Kodak founder George Eastman proposed an International Fixed Calendar which manages to have the numerical days of each month fall on the same weekday; for example, the 15th day of each month would always be a Sunday.  The idea was to facilitate business activities such as scheduling regular meetings, and make it easier to accurately compare monthly and quarterly statistics.

Will we see a shift to one of these new and improved versions of our calendar system?  Probably not.  After all, the U.S. has failed to adopt the metric standard of measurements, despite it being the universal system for scientific inquiry around the world.  In the end, a messy system we’re all familiar with tends to be preferable to a tidy one that forces us to change our habits.

About the Author: Bob Veres has been a commentator, author and consultant in the financial services industry for more than 20 years.  Over his 20-year career in the financial services world, Mr. Veres has worked as editor of Financial Planning magazine; as a contributing editor to the Journal of Financial Planning; as a columnist and editor-at-large of Dow Jones Investment Advisor magazine; and as editor of Morningstar’s advisor web site:

Mr. Veres has been named one of the most influential people in the financial planning profession by Investment Advisor magazine and Financial Planning magazine, was granted the NAPFA Special Achievement Award by the National Association of Personal Financial Advisors, and most recently the Heart of Financial Planning Distinguished Service Award from the Denver-based Financial Planning Association. 


The Geopolitics of the Gregorian Calendar

The history of calendrical reform has been shaped by the egos of emperors, disputes among churches, the insights of astronomers and mathematicians, and immutable geopolitical realities.


One thought on “Calendar Facts”

  1. The 7 day week, for which we can thank the Babylonians, is a major PIA and an exercise in the frustration of prime numbers as anyone who needs to do something 3 times a week or every other day, can testify.

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