Calendar Adjustment Day - September 2
Sat, Sep 2, 2023

Calendar Adjustment Day

Calendar Adjustment Day is not just an opportunity to change your personal calendar and make adjustments to it. On September 2, an event occurred that affected the interests of many people – the beginning of the New Year was moved to January 1, and the calendar system changed dramatically.


In accordance with the British Calendar Act, passed in 1751, Britain switched to the Gregorian calendar. However, the synchronization of the two calendars required 11 days to be excluded from people’s lives – people went to bed on September 2, and woke up on September 14. Such changes led to the New Year being celebrated on January 1st. Such changes were disliked by ordinary people, because 11 days were stolen from their lives, but this was inevitable, since the whole of Europe lived according to the Gregorian calendar.

The changes were accompanied by unrest, as people did not agree with the transfer of many holidays, especially Easter. The civilian population did not accept the new dates, calling them incorrect. Since then, two terms have appeared in historical documents – the old style, and the new style. So that the transition did not affect people so sharply with the disappearance of 11 days from their lives, it was carried out in several stages.

Interesting facts

  • The Gregorian system was originally developed for the sole purpose of changing the date of Easter.
  • It was not Pope Gregory who worked on the calendar; he entrusted this work to the physician Aloysius Lilius, as well as to the astronomer Christopher Clavius.
  • The first printed version of the Gregorian calendar was published in 1582.
  • Protestants called the new calendar a satanic program.
  • Astronomers use the Julian calendar for calculations.

How to take part

Get a desk calendar – the print version doesn’t compare to the electronic one. Mark all the important events on your calendar. Watch a movie about the lost 11 days that were never found – like Foucault’s Pendulum, Doctor Who, or Slammerkin.

When is Calendar Adjustment Day celebrated in 2023?

Calendar Adjustment Day is observed on September 2 each year.


Weekday Month Day Year
Saturday September 2 2023
Monday September 2 2024
Tuesday September 2 2025
Wednesday September 2 2026