This JavaScript calculator computes the day of Easter (and related dates) for a given year using Oudin's algorithm. The algorithm works for years beginning with 1583 AD - this was the first Easter after the adoption of the Gregorian calendar in October of 1582. However, the Gregorian calendar was not adopted by all countries at the same time. In some parts of what is now the United States, the change was made in 1582, but in the thirteen British colonies the change became effective in 1752. Alaska did not adopt the Gregorian calendar until 1867.
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