From 7206211d3960fb151c475cb28e11f9b7be42470b Mon Sep 17 00:00:00 2001
From: subeshb1 <subeshb1@gmail.com>
Date: Sat, 13 Oct 2018 00:35:53 +0545
Subject: [PATCH] Releasing First Version

---
 package.json |  26 ++++++
 src/index.js | 239 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 265 insertions(+)
 create mode 100644 package.json
 create mode 100644 src/index.js

diff --git a/package.json b/package.json
new file mode 100644
index 0000000..1b8e902
--- /dev/null
+++ b/package.json
@@ -0,0 +1,26 @@
+{
+  "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"
+}
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 0000000..37d961c
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,239 @@
+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;