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From: "Kent, John G" <>
Subject: TMG-L: Dates: Those missing 11 days?
Date: Fri, 3 Mar 2000 08:48:45 -0000

It was recently stated that "So if you add back those 11 days back to
the TMG calendar for Jan 19, you get 30 Jan. In that case, 30 Jan 1666
on the TMG calendar was on Saturday."

I am sorry but this is wrong and will confuse people.

19-Jan-1666(Julian) = 29-Jan-1666(Gregorian) = Saturday
19-Jan-1667(Julian) = 29-Jan-1667(Gregorian) = Friday
(I use 1st Jan as new years day in each case)
------------
Explanation:
Most Catholic countries missed out 10 days in October 1582 (5th - 14th
inclusive) when they changed to the Gregorian calendar.

So the calendars were 10 days apart from Oct/1582 to Feb/1600.
ie 5-Oct-1582(Julian) = 15-Oct-1582(Gregorian)

1600 was a leap year in both calendars - so they remained 10 days apart from
Feb/1600 to Feb/1700.
ie 5-Oct-1625(Julian) = 15-Oct-1625(Gregorian)

BUT!
1700(Gregorian) was not a leap year and Feb had 28 days
1700(Julian) was a leap year and Feb had 29 days
So after this the calendars were 11 days apart.
ie 5-Oct-1725(Julian) = 16-Oct-1725(Gregorian)
--------------------

By 1800 most countries had changed over to Gregorian, but in Greece
1800, still using the Julian calendar, was a leap year. From then on the
Greek calendar was 12 days adrift. And by 1923 when they changed over
the difference was 13 days!

John
- -------------------------------
John Kent
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• TMG-L: Dates: Those missing 11 days? by "Kent, John G" <>