By Mary Davis
I thought Daylight Saving Time was confusing with each region, state, county, and city doing their own thing until it was standardized in 1966. (See my article on DST for the full, crazy story. https://www.hhhistory.com/2018/04/its-about-time.html ) Then earlier this month Suzanne Norquist wrote an article about time zones. (See her article. https://www.hhhistory.com/2026/10/whose-time-is-it-anyway.html) Now, I have delved into the idiosyncrasies of the calendar system, which was no easy matter.
Keeping track of the passage of time goes back to prehistoric eras. Since the earth’s population was so spread out, each region had their own date-keeping system, or no system at all and went by lunar cycles.
Along came the Julian calendar in 45 BC instituted by Julius Caesar, with the start of the year on March 25th. Why such a random day? Your guess is as good as mine. It also introduced the Leap Day, which I’ll cover later in this article.
The Julian calendar was rocking along until 1582 when Pope Gregory XIII instituted a new calendar to correct dating errors in the Julian calendar, which had too many Leap Years. This discrepancy had been noted for centuries and worked on by various people, then finally a new calendar was implemented under Pope Gregory XIII.
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| 1st page of the document to reform the Julian calendar |
It took nations a while to make this change. Catholic dominated countries made the switch right away in 1582, while others held out until the 20th Century. Greece finally got on board in 1923 and Saudi Arabia not until 2016. England, Wales, Ireland, and British territories didn’t make the change until 1752, 170 years after it was established. They didn’t want to give the appearance of being under the control of the Catholic Church again.

Adoption of Gregorian Calendar by country
During this time (1582-1923) when countries were making up their minds, people used “dual dating”. When dates were written, they would reflect both the Julian calendar, Old Style (O.S.), and the Gregorian calendar, New Style (N.S.). O.S. and N.S. were mainly used in the British Empire.
In what year was Wednesday, September 4th followed by Thursday, September 15th? The year was 1752. It was a short month that year. What happened to those eleven days? And why were they wiped from history?
It all has to do with Leap Day. Leap Day was once every four years on February 24th O.S., not the 29th but the 24th. So, the day after February 24th was . . . February 24th.
Again.
Having a Leap Day goes all the way back to before the start of the Julian calendar. Scientists and astronomers figured out that there were more than 365 days in a year, but not a whole day, only a quarter. Over the decades, this quarter day changed the unchanging equinoxes. To compensate for this, every fourth year, a day was added . . . between February 24th and the 25th, giving the month two of the same day. Therefore, if you were born on the 24th or the once-every-four-years leap day—also the 24th—you would never miss your birthday. Eventually, this extra day was moved to the end of the month.
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| Post-Medieval Perpetual Calendar Coin |
So, back to the missing eleven days. A calendar year doesn’t have an even 365 days and six hours in it. Actually, it’s 365 days, five hours, forty-eight minutes, and forty-five seconds. This caused the calendar to be out of alignment from the earth’s orbit. When you add up all those extra minutes over hundreds of years, your calendar is off by eleven days. The more centuries that pass the more days your calendar is off.
Some people wanted to make up for these days by omitting the Leap Days over the next forty years. Others wanted to rip the bandage off and take care of those days all at once. The latter won. So September 4th was followed by the 15th. So, if your birthday fell between those dates, did that mean no cake or presents? Say it ain’t so!
Here is an example of some of the confusion caused by different countries using different calendars. William III of England sailed from the Netherlands on November 11, 1688 (Gregorian calendar) and, apparently, traveled back in time to arrive in England on November 5th of that year (Julian calendar).
But wait, there’s more. New Year’s Day used to be March 25th. The new calendar moved it to January 1st. So, 1752 had only nine months for the British Empire, and 1753 became the new twelve-month cycle.
Because of all these date changes and subtracting days from the calendar, people used “dual dating”. They would combine what the date would be according to both the O.S. calendar and the N.S. Therefore, with not everyone using the same calendar, a date in a ledger or elsewhere might be written like this: 10/21 February 1750/1. The day of the month in the O.S. would be on the 10th of 1750, while on the N.S. it would be 21 February 1751 to account for the eleven-day drift and the New Year’s Day change. Dual dating helped avoid confusion.
Interestingly, George Washington and Thomas Jefferson fell victim to this dual dating dilemma. Washington’s birthday is officially February 22, 1732 N.S., but he was born on February 11, 1731 O.S. Or it could be written 11/22 February 1731/2. Jefferson instructed to have on his tombstone, his birth date to be according to the Julian calendar (O.S.) and his death date the Gregorian calendar (N.S.).
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| Jefferson Tombstone--"BORN APRIL 2 1743 O.S. DIED JULY 4 1826" |
Still, not everyone strictly uses the Gregorian calendar. There are many other calendars in use today that are utilized alongside the Gregorian calendar.
Time is fascinating, but it sure can be confusing.
THE QUILTING CIRCLE SERIES Box Set
Historical Romance Series
By Mary Davis
THE WIDOW’S PLIGHT (Book1) – Will a secret clouding a single mother’s past cost Lily her loved ones?
THE DAUGHTER’S PREDICAMENT (Book2) *SELAH & WRMA Finalist* – As Isabelle’s romance prospects turn in her favor, a family scandal derails her dreams.
THE DAMSEL’S INTENT (Book3) *SELAH Winner* – Nicole heads down the mountain to fetch herself a husband. Can she learn to be enough of a lady to snag the handsome rancher?
THE DÉBUTANTE’S SECRET (Book4) – Complications arise when a fancy French lady steps off the train and into Deputy Montana’s arms.
Mary lives in Colorado with her Carolina Dog, Shelby, and her pocket black Lab, Willow. She has three adult children and three incredibly adorable grandchildren. Find her online at: Books2Read Newsletter Blog FB FB Readers Group Amazon GoodReads BookBub
Sources
https://en.wikipedia.org/wiki/Old_Style_and_New_Style_dates
https://en.wikipedia.org/wiki/Dual_dating
https://en.wikipedia.org/wiki/Adoption_of_the_Gregorian_calendar
https://everything.explained.today/Old_Style_and_New_Style_dates/






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