rrule/dist/esm/iterinfo/easter.js

export function easter(y, offset) {
    if (offset === void 0) { offset = 0; }
    var a = y % 19;
    var b = Math.floor(y / 100);
    var c = y % 100;
    var d = Math.floor(b / 4);
    var e = b % 4;
    var f = Math.floor((b + 8) / 25);
    var g = Math.floor((b - f + 1) / 3);
    var h = Math.floor(19 * a + b - d - g + 15) % 30;
    var i = Math.floor(c / 4);
    var k = c % 4;
    var l = Math.floor(32 + 2 * e + 2 * i - h - k) % 7;
    var m = Math.floor((a + 11 * h + 22 * l) / 451);
    var month = Math.floor((h + l - 7 * m + 114) / 31);
    var day = ((h + l - 7 * m + 114) % 31) + 1;
    var date = Date.UTC(y, month - 1, day + offset);
    var yearStart = Date.UTC(y, 0, 1);
    return [Math.ceil((date - yearStart) / (1000 * 60 * 60 * 24))];
}
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