An event every year that begins at 00:00 on day 2 of September, repeating indefinitely
When: September 2
First occurrence: 1752
September 2, 1752, was the day when the Gregorian calendar became the main calendar for Great Britain.
Before this date two calendars were used. The Julian calendar and the Gregorian.
In the following years the rest of Europe would follow in using this calendar standard.