This JavaScript calculator computes the dates of Rosh Hashanah, Yom Kippur and Passover for a Gregorian calendar year (from 1582 A.D. onward). This is not a full implementation of a Hebrew calendar program, just my best effort at computing some of the major holiday dates.
The holidays begin at sundown on the evening before the day given. For the holidays which are celebrated on more than one day, the first day is the one listed.
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