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@subeshb1
subeshb1 committed Oct 12, 2018
1 parent 7a6008c commit 7206211
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26 changes: 26 additions & 0 deletions package.json
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{
"name": "nepali-date",
"version": "1.0.0",
"description": "A small Js library to convert English date to Nepali and Vice Versa",
"main": "src/index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"repository": {
"type": "git",
"url": "git+https://github.com/subeshb1/Nepali-Date.git"
},
"keywords": [
"nepali",
"date",
"english",
"date",
"converter"
],
"author": "'Subesh <'subeshb1@gmail.com'>",
"license": "MIT",
"bugs": {
"url": "https://github.com/subeshb1/Nepali-Date/issues"
},
"homepage": "https://github.com/subeshb1/Nepali-Date#readme"
}
239 changes: 239 additions & 0 deletions src/index.js
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const compose = (...fns) => (...args) =>
fns.reduceRight((acc, next) => [next.call(null, ...acc)], args)[0];
const map = fn => x => x.map(fn);
const add = (a, b) => a + b;
const reduce = fn => acc => x => x.reduce(fn, acc);
const calculateDaysInEachYearD = compose(map(reduce(add)(0)));

const nepaliYears = [
[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 31, 32, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[30, 32, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 31, 32, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[30, 32, 31, 32, 31, 31, 29, 30, 29, 30, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31],
[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
[31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
[31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
[31, 31, 32, 32, 31, 30, 30, 30, 29, 30, 30, 30],
[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30],
[31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30],
[31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30],
[31, 32, 31, 32, 30, 31, 30, 30, 29, 30, 30, 30],
[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30],
[31, 31, 32, 31, 31, 31, 30, 30, 29, 30, 30, 30],
[30, 31, 32, 32, 30, 31, 30, 30, 29, 30, 30, 30],
[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30],
[30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30]
];

const begin = {
year: 2000,
month: 0,
date: 1,
day: 3
};
const beginEnglish = {
year: 1943,
month: 3,
date: 14,
day: 3
};
const initTime = new Date(
beginEnglish.year,
beginEnglish.month,
beginEnglish.date
);
//2054/06/24
const dayDiff = (date1, date2) => {
const timeDiff = Math.abs(date2.getTime() - date1.getTime());
const diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
return diffDays;
};

const bsFromDays = difference => {
let bsYear = begin.year;
let bsMonth;
let bsDate = begin.date;
let days = 0;
for (let year of nepaliYears) {
bsMonth = 0;
for (let month of year) {
if (days + month < difference) {
days += month;
} else {
bsDate = difference - days + 1 || month;
return [bsYear, bsMonth, bsDate];
}
bsMonth++;
}
bsYear++;
}
};

const monthsName = [
"Baisakh",
"Jestha",
"Asadh",
"Shrawan",
"Bhadra",
"Ashwin",
"Kartik",
"Mangshir",
"Poush",
"Magh",
"Falgun",
"Chaitra"
];
const weekDay = [
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday"
];

class NepaliDate {
constructor(year = begin.year, month = begin.month, date = begin.date) {
this.year = year || 2000;
this.month = month % 12 || 0;
this.date = date !== 0 ? date : nepaliYears[year % 100][month];
this.convertBStoAD();
}

convertBStoAD() {
const diff = {
year: this.year - begin.year,
month: this.month - begin.month,
date: this.date - begin.date
};
if (diff.year < 0 || diff.year > 90)
throw new TypeError("Can only support from 2000BS to 2090BS");
const arr = nepaliYears
.slice(0, diff.year)
.concat([[...nepaliYears[diff.year].slice(0, diff.month), diff.date]]);
let diffDays = reduce(add)(0)(calculateDaysInEachYearD(arr));
this.ad = new Date(
beginEnglish.year,
beginEnglish.month,
beginEnglish.date + diffDays
);
this.day = this.ad.getDay();
}
setMonth(month) {
this.month = month;
}
setMonth(year) {
this.year = year;
}

toAD() {
return {
year: this.ad.getFullYear(),
month: this.ad.getMonth(),
date: this.ad.getDate()
};
}
toJSDate() {
return new Date(this.ad.getTime());
}
getDateAD() {
return this.ad.getDate();
}
getDay() {
return this.day;
}
getMonthAD() {
return this.ad.getMonth();
}
static fromAD(
year = beginEnglish.year,
month = beginEnglish.month,
date = beginEnglish.date
) {
const difference = dayDiff(initTime, new Date(year, month, date));
return new NepaliDate(...bsFromDays(difference));
}
static now() {}
toString() {
return `${weekDay[this.day]}, ${monthsName[this.month]} ${this.date}, ${
this.year
} BS`;
}
}

module.exports = NepaliDate;

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