czech-holidays/index.js

A function to return public holidays in the Czech Republic in the specified year.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var holidayDates = [{ d: 1, m: 1 }, { d: 1, m: 5 }, { d: 8, m: 5 }, { d: 5, m: 7 }, { d: 6, m: 7 }, { d: 28, m: 9 }, { d: 28, m: 10 }, { d: 17, m: 11 }, { d: 24, m: 12 }, { d: 25, m: 12 }, { d: 26, m: 12 }];
// https://gist.github.com/johndyer/0dffbdd98c2046f41180c051f378f343
function getEaster(year) {
    var f = Math.floor, 
    // Golden Number - 1
    G = year % 19, C = f(year / 100), 
    // related to Epact
    H = (C - f(C / 4) - f((8 * C + 13) / 25) + 19 * G + 15) % 30, 
    // number of days from 21 March to the Paschal full moon
    I = H - f(H / 28) * (1 - f(29 / (H + 1)) * f((21 - G) / 11)), 
    // weekday for the Paschal full moon
    J = (year + f(year / 4) + I + 2 - C + f(C / 4)) % 7, 
    // number of days from 21 March to the Sunday on or before the Paschal full moon
    L = I - J, month = 3 + f((L + 40) / 44), day = L + 28 - 31 * f(month / 4);
    return { m: month, d: day };
}
function CzechHolidays(year) {
    var holidays = JSON.parse(JSON.stringify(holidayDates));
    var easterSunday = getEaster(year);
    var easterFridayDate = new Date(year, easterSunday.m - 1, easterSunday.d);
    easterFridayDate.setDate(easterFridayDate.getDate() - 2);
    var easterMondayDate = new Date(year, easterSunday.m - 1, easterSunday.d);
    easterMondayDate.setDate(easterMondayDate.getDate() + 1);
    holidays.push({ d: easterFridayDate.getDate(), m: easterFridayDate.getMonth() + 1 });
    holidays.push({ d: easterMondayDate.getDate(), m: easterMondayDate.getMonth() + 1 });
    holidays.sort(function (a, b) { return a.m - b.m || a.d - b.d; });
    return holidays;
}
exports.CzechHolidays = CzechHolidays;