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Releasing First Version
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‎package.json‎

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{
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"name": "nepali-date",
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"version": "1.0.0",
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"description": "A small Js library to convert English date to Nepali and Vice Versa",
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"main": "src/index.js",
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"repository": {
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"type": "git",
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"url": "git+https://github.com/subeshb1/Nepali-Date.git"
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},
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"keywords": [
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"nepali",
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"date",
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"english",
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"date",
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"converter"
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],
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"author": "'Subesh <'[email protected]'>",
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"license": "MIT",
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"bugs": {
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"url": "https://github.com/subeshb1/Nepali-Date/issues"
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},
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"homepage": "https://github.com/subeshb1/Nepali-Date#readme"
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}

‎src/index.js‎

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const compose = (...fns) => (...args) =>
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fns.reduceRight((acc, next) => [next.call(null, ...acc)], args)[0];
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const map = fn => x => x.map(fn);
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const add = (a, b) => a + b;
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const reduce = fn => acc => x => x.reduce(fn, acc);
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const calculateDaysInEachYearD = compose(map(reduce(add)(0)));
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const nepaliYears = [
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[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 31, 32, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[30, 32, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 31, 32, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[30, 32, 31, 32, 31, 31, 29, 30, 29, 30, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
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[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
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[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
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[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
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[31, 31, 32, 32, 31, 30, 30, 30, 29, 30, 30, 30],
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[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30],
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[31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30],
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[31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30],
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[31, 32, 31, 32, 30, 31, 30, 30, 29, 30, 30, 30],
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[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30],
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[31, 31, 32, 31, 31, 31, 30, 30, 29, 30, 30, 30],
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[30, 31, 32, 32, 30, 31, 30, 30, 29, 30, 30, 30],
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[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30],
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[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30]
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];
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const begin = {
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year: 2000,
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month: 0,
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date: 1,
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day: 3
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};
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const beginEnglish = {
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year: 1943,
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month: 3,
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date: 14,
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day: 3
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};
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const initTime = new Date(
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beginEnglish.year,
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beginEnglish.month,
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beginEnglish.date
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);
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//2054/06/24
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const dayDiff = (date1, date2) => {
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const timeDiff = Math.abs(date2.getTime() - date1.getTime());
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const diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
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return diffDays;
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};
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const bsFromDays = difference => {
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let bsYear = begin.year;
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let bsMonth;
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let bsDate = begin.date;
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let days = 0;
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for (let year of nepaliYears) {
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bsMonth = 0;
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for (let month of year) {
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if (days + month < difference) {
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days += month;
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} else {
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bsDate = difference - days + 1 || month;
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return [bsYear, bsMonth, bsDate];
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}
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bsMonth++;
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}
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bsYear++;
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}
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};
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const monthsName = [
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"Baisakh",
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"Jestha",
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"Asadh",
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"Shrawan",
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"Bhadra",
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"Ashwin",
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"Kartik",
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"Mangshir",
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"Poush",
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"Magh",
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"Falgun",
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"Chaitra"
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];
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const weekDay = [
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"Sunday",
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"Monday",
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"Tuesday",
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"Wednesday",
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"Thursday",
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"Friday",
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"Saturday"
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];
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class NepaliDate {
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constructor(year = begin.year, month = begin.month, date = begin.date) {
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this.year = year || 2000;
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this.month = month % 12 || 0;
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this.date = date !== 0 ? date : nepaliYears[year % 100][month];
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this.convertBStoAD();
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}
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convertBStoAD() {
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const diff = {
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year: this.year - begin.year,
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month: this.month - begin.month,
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date: this.date - begin.date
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};
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if (diff.year < 0 || diff.year > 90)
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throw new TypeError("Can only support from 2000BS to 2090BS");
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const arr = nepaliYears
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.slice(0, diff.year)
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.concat([[...nepaliYears[diff.year].slice(0, diff.month), diff.date]]);
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let diffDays = reduce(add)(0)(calculateDaysInEachYearD(arr));
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this.ad = new Date(
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beginEnglish.year,
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beginEnglish.month,
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beginEnglish.date + diffDays
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);
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this.day = this.ad.getDay();
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}
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setMonth(month) {
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this.month = month;
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}
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setMonth(year) {
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this.year = year;
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}
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toAD() {
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return {
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year: this.ad.getFullYear(),
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month: this.ad.getMonth(),
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date: this.ad.getDate()
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};
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}
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toJSDate() {
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return new Date(this.ad.getTime());
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}
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getDateAD() {
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return this.ad.getDate();
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}
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getDay() {
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return this.day;
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}
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getMonthAD() {
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return this.ad.getMonth();
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}
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static fromAD(
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year = beginEnglish.year,
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month = beginEnglish.month,
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date = beginEnglish.date
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) {
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const difference = dayDiff(initTime, new Date(year, month, date));
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return new NepaliDate(...bsFromDays(difference));
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}
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static now() {}
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toString() {
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return `${weekDay[this.day]}, ${monthsName[this.month]} ${this.date}, ${
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this.year
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} BS`;
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}
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}
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module.exports = NepaliDate;

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