The same date conversion rules applied to Ireland as they did Britain.
The following diagram illustrates the number of days to be added when converting from Julian to Gregorian calendar dates: When converting from the Julian to the Gregorian calendar, the date, 11 June 1690, would be 21 June 1690.
When the Gregorian calendar was created in 1582, it was realized that the Julian calendar was 10 days out of synch with the solar year.
To restore proper synchronization with the seasons, the new calendar dropped 10 days from the month of October in 1582, and to prevent the problem of extra days from occurring again, 1 day was added to February for every year divisible by four (leap year).
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