U.S.A. Julian / Gregorian Calendar Transition of 1752The calendar below represents the Julian/Gregorian transition calendar of September, 1752, the official end of the old-style Julian calendar system and the beginning of our modern Gregorian calendar used in the United States and most of the world today.
In the Colonies, the old-style Julian calendar officially ended on:
Wednesday, September 2nd, 1752. - Highlighted in yellow .
JD Number = 2361221
Also in 1752, January 1st became New Year's Day. Prior to 1752,
New Year's Day was March 25th.
The date following September 2nd was the official institution of
the modern Gregorian calendar in the U.S. and that date was:
Thursday, September 14th, 1752. - Highlighted in cyan .
JD Number = 2361222
As a result, the transition year, 1752, was both a Julian and a Gregorian year in the Colonies, with the first 246 days being on the Julian calendar and the last 120 days being on the Gregorian calendar, for a total of 355 calendar days that year due to the 11 dropped days and the fact that 1752 was also a leap year.
Jay Tanner - 2016