EC.JS

For Development Purpose (only 20 % done)

EC.Js (Ethiopian calendar- የኢትዮጲያ የቀን መቁጠሪያ) aims to implement Ethiopian Calendar conversion plus other functionalities

Installation

 <script src="ec.js"></script>

 npm install ec.js --save

 var EC = require('ec.js')

Check the Usage section

Features

• toEC Date conversion from Gregorian to Ethiopian
• toGC Date conversion from Ethiopian to Gregorian
• leapYear Determine whether or not this date is in a leap year
• formatYear Retrieve the formatted year for this date
• weekOfYear Retrieve the number of the week within the year in which this date is located
• daysInYear Retrieve the number of days in this date's year.
• dayOfYear Retrieve this date's position within the year
• daysInMonth Retrieve the number of days in this date's month
• dayOfWeek Determine this date's day of the week
• weekDay Determine whether or not this date is a normal week day
• add Add a number of periods to this date
• set Set a period for this date
• compareTo Compare this date to another date
• toJD Retrieve the Julian date for this date
• fromJD Create a new date for a given Julian date.
• toJSDate Convert this date into the equivalent JavaScript Date
• toString Retrieve a string representation of this date
• Accepts new calendar type (Siltie, Oromo, Sidama and Borena) as a plugin
• Localisation option for each calendar

- You can also suggest more features on the issue section

- Make a PR to contribute

Usage

Get instance

// Ethiopian calendar instance
var et = EC.instance('ethiopian');
// Gregorian calendar instance
var gc = EC.instance()

note: date validation does not work yet

today()

//get today Date in EC 2009-10-21
et.today().toString()

//get today Date in EC 2009/10/21
et.today().toString('/') 

// get today Date in JS Date format
gc.today().toJSDate();

// get today Date in string format
gc.today().toString();

fromJSDate()

//get EC for JS Date
et.fromJSDate(new Date()).toString()

//get EC for JS Date -new Date("2017-10-20") ->  2010-02-10
et.fromJSDate(new Date("2017-10-20")).toString()

// get GC from sample JS Date and convert to JS format
// toJSDate only works for GC dates
gc.fromJSDate(new Date("2017-10-20")).toJSDate())

toEC()

//get current date in GC and convert it to EC in string format

gc.today().toEC().toString();

// get GC for sample JS Date and convert it to EC in string Format
gc.fromJSDate(new Date("2017-10-20")).toEC().toString()

toGC()

// convert today from EC to GC and get the result in JS Date
et.today().toGC().toJSDate()

//convert today from EC to GC and get the result in string with default separator
et.today().toGC().toString()

leapYear()

// check if the EC date is leap year or not
et.today().leapYear() // true or false

//check if the GC date is leap year or not
gc.today().leapYear() // true or false

set()

// set current date to 30 and return string format
et.today().day(30).toString()

// set current month to 5 and return string format
et.today().month(5).toString()

// set current year to 2011 and return string format
et.today().year(2011).toString()

// set current date to 30 and return string format
gc.today().day(30).toString()

// set current month to 5 and return string format
gc.today().month(5).toString()

// set current year to 2011 and return string format
gc.today().year(2018).toString()

Implementation Points

• Leap years occur every four years on the third year of a cycle.
• Each year has 12 months of 30 days and an intercalary month of 5 or 6 days, making 365 or 366 days in total.
• The first day of the week is Ehud - እሁድ (Sunday).

Resources

• Ethiopian Calendar wikipedia
• Drs. Berhanu Beyene and Manfred Kudlek Geez Calendars