feat(datetime converter): back and forth datetime converter

src/datetime.js

@@ -0,0 +1,145 @@
+var Local = require('./local');
+var Language = require('./language');
+var JDNConverter = require('./JDN_converter');
+var TimeConverter = require('./time_converter');
+
+/**
+ *  Create an new DateTime object for the given Date object
+ * 
+ * @param {Date} date 
+ * @public
+ */
+
+function DateTime (date, timezone = 'Africa/Addis_Ababa') {
+
+    if( !(date instanceof Date) )
+        throw 'Datetime must be instance of Date';
+
+    this.date = date;
+
+    if( timezone != null )
+        this.timezone( timezone );
+
+}
+
+/**
+ * Convert time UTC/GMT timezone to Ethiopic time zone 
+ *  i.e UTC + 3 Hours
+ *      GMT + 3 Hours
+ * 
+ * @param {string} timezone
+ * @return null
+ */
+
+DateTime.prototype.timezone = function ( timezone ) {
+
+    date_str = this.date.toLocaleString("en-US", {timeZone: timezone});
+
+    this.date = new Date( date_str );
+
+}
+
+/**
+ * 
+ * @return dictionary
+ */
+
+DateTime.prototype.gregorianToEthiopic = function () {
+
+    year = this.date.getFullYear();
+
+    month = this.date.getMonth();
+
+    day = this.date.getDate();
+
+    hours = this.date.getHours();
+
+    jdn = JDNConverter.gregorianToJDN ( year, month, day );
+
+    era = JDNConverter.getEraFromJDN ( jdn );
+
+    date = JDNConverter.jdnToEthiopic ( jdn, era );
+
+    hours = TimeConverter.utcToEthiopic( TimeConverter.to12hrFormat(hours) );
+
+    var datetime = {
+        'year' : date['year'],
+        'month' : date['month'],
+        'day' : date['day'],
+        'hour': hours,
+        'minute': this.date.getMinutes(), 
+        'second' : this.date.getSeconds()
+    }
+
+	return datetime;
+}
+
+/**
+ * 
+ * @return dictionary
+ */
+DateTime.prototype.ethiopicToGregorian = function () {
+
+    year = this.date.getFullYear();
+
+    month = this.date.getMonth();
+
+    day = this.date.getDate();
+
+    hours = this.date.getHours();
+
+    jdn = JDNConverter.ethCopticToJDN ( year, month, day );
+
+    date = JDNConverter.jdnToGregorian ( jdn );
+
+    hours = TimeConverter.ethiopicToUtc( TimeConverter.to12hrFormat(hours) );
+
+    var datetime = {
+        'year' : date['year'],
+        'month' : date['month'],
+        'day' : date['day'],
+        'hour': hours,
+        'minute': this.date.getMinutes(), 
+        'second' : this.date.getSeconds()
+    }
+
+	return datetime;
+}
+
+/**
+ * Converter
+ * 
+ * @param {Local} local
+ * @param {Language} language
+ * @return dictionay
+ */
+
+DateTime.prototype.convert = function ( local = Local.ETHIOPIC, lanugage = Language.AMHARIC ) {
+
+    if( Object.values(Local).indexOf(local) == -1 )
+        throw 'Local must be instance of Alfa Gee`z\'s Local';
+
+    if( Object.values(Local).indexOf(local) == -1 )
+        throw 'Language must be instance of Alfa Gee`z\'s Language';
+
+    this.local = local;
+    this.lanugage = language;
+
+    if( local == Local.ETHIOPIC )
+        new_datetime = this.gregorianToEthiopic();
+    else if( local == Local.GREGORIAN )
+        new_datetime = this.ethiopicToGregorian();
+
+    this.new_datetime = new_datetime
+
+    return new_datetime;
+}
+
+
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = DateTime

src/index.js

@@ -1 +1,12 @@
-console.log("hello World");
+var alfaGeezDatetime = require('./src/datetime');
+
+var alfaGeezLocal = require('./src/local');
+
+var alfaGeezLang = require('./src/language');
+
+
+module.exports.DateTime = alfaGeezDatetime;
+
+module.exports.Local = alfaGeezLocal;
+
+module.exports.Language = alfaGeezLang;

src/language.js

@@ -0,0 +1,29 @@
+/**
+ * Language Lists
+ * @var {array} lang
+ * @public
+ */
+
+const lang = {
+    AMHARIC : {
+        'id' : 1,
+
+        'name' : 'amharic',
+
+        'months' : [
+			'መስከረም', 'ጥቅምት', 'ኅዳር', 'ታኅሣሥ', 'ጥር', 'የካቲት', 'መጋቢት', 'ሚያዝያ', 'ግንቦት', 'ሰኔ', 'ሐምሌ', 'ነሐሴ', 'ጳጉሜን'
+        ],
+
+		'days' : [
+			'ሰኞ', 'ማክሰኞ', 'ረቡዕ', 'ሐሙስ', 'ዓርብ', 'ቅዳሜ', 'እሑድ'
+		],
+    }
+}
+
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = lang

src/local.js

@@ -0,0 +1,19 @@
+/**
+ * Localization Lists
+ * @var {int} local
+ * @public
+ */
+
+const local = {
+    ETHIOPIC : 1,
+    GREGORIAN : 2
+}
+
+
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = local