var objDate = new Date("10/11/2009");

var date = new Date("10/11/2009"),
    locale = "en-us",
    month = date.toLocaleString(locale, { month: "long" });

var formatter = new Intl.DateTimeFormat("fr", { month: "short" }),
month1 = formatter.format(new Date()),
month2 = formatter.format(new Date(2003-05-12));

// sept. and déc.
console.log(month1 + " and " + month2);

Date.prototype.getMonthName = function(lang) {
    lang = lang && (lang in Date.locale) ? lang : 'en';
    return Date.locale[lang].month_names[this.getMonth()];
};

Date.prototype.getMonthNameShort = function(lang) {
    lang = lang && (lang in Date.locale) ? lang : 'en';
    return Date.locale[lang].month_names_short[this.getMonth()];
};

Date.locale = {
    en: {
       month_names: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
       month_names_short: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    }
};

Date.locale.fr = {month_names: [...]};

Date.prototype.monthNames = [
    "January", "February", "March",
    "April", "May", "June",
    "July", "August", "September",
    "October", "November", "December"
];

Date.prototype.getMonthName = function() {
    return this.monthNames[this.getMonth()];
};
Date.prototype.getShortMonthName = function () {
    return this.getMonthName().substr(0, 3);
};

// usage:
var d = new Date();
alert(d.getMonthName());      // "October"
alert(d.getShortMonthName()); // "Oct"

moment().format("MMM");  // "April" - current date
moment(new Date(2012, 01, 04)).format("MMM");  // "Feb" - from a local date
moment.utc(new Date(2012, 00, 04).format("MMM"); // "Jan" - from a UTC date

var objDate = new Date("10/11/2009");
document.write(objDate.toString("MMMM"));

Date.prototype.getMonthName = function() {
    var monthNames = [ "January", "February", "March", "April", "May", "June",
                       "July", "August", "September", "October", "November", "December" ];
    return monthNames[this.getMonth()];
}

var month_Name = new Date().getMonthName();

var monthNames = ["January", "February", "March", "April", "May", "June",
  "July", "August", "September", "October", "November", "December"
];
var monthShortNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
];

function dateFormat1(d){
  var t = new Date(d);
  return t.getDate()+' '+monthNames[t.getMonth()]+', '+t.getFullYear();
}

function dateFormat2(d){
  var t = new Date(d);
  return t.getDate()+' '+monthShortNames[t.getMonth()]+', '+t.getFullYear();
}

Date.prototype.getMonthName = function() {
    var monthNames = [ "January", "February", "March", "April", "May", "June",
                       "July", "August", "September", "October", "November", "December" ];
    return monthNames[this.getMonth()];
}


Date.prototype.getFormatDate = function() {
    var monthNames = [ "January", "February", "March", "April", "May", "June",
                       "July", "August", "September", "October", "November", "December" ];
    return this.getDate()+' '+monthNames[this.getMonth()]+', '+this.getFullYear();
}

var monthsLocalizedArray = function(locale) {
    var result = [];
    for(var i = 0; i < 12; i++) {
        result.push(new Date(2010,i).toLocaleString(locale,{month:"long"}));
    }
    return result;
};

console.log(monthsLocalizedArray('en')); // -> ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
console.log(monthsLocalizedArray('bg')); // -> ["януари", "февруари", "март", "април", "май", "юни", "юли", "август", "септември", "октомври", "ноември", "декември"]

var monthLocalizedString = function(month, locale) {
    return new Date(2010,month).toLocaleString(locale,{month:"long"});
};

console.log(monthLocalizedString(1, 'en')); // -> February
console.log(monthLocalizedString(1, 'bg')); // -> февруари
console.log(monthLocalizedString(1, 'de')); // -> Februar

moment(new Date).format("MMMM YYYY");

var objDate = new Date().toLocaleString("en-us", { month: "long" }); // result: August
var objDate = new Date().toLocaleString("en-us", { month: "short" }); // result: Aug

var objDate = new Date("10/11/2009");

var strDate =
    objDate.toLocaleString("en", { day: "numeric" }) + ' ' +
    objDate.toLocaleString("en", { month: "long"  }) + ' ' +
    objDate.toLocaleString("en", { year: "numeric"});

objDate.toString().split(" ")[1]; // gives short name, unsure about locale
objDate.toLocaleDateString.split(" ")[0]; // gives long name

js> objDate = new Date(new Date() - 9876543210)
Mon Feb 04 2013 12:37:09 GMT-0800 (PST)
js> objDate.toString().split(" ")[1]
Feb
js> objDate.toLocaleString().split(" ")[0]
February

Date.prototype.monthName = function() {
    return this.toUTCString().split(' ')[2]
};

d = new Date();
//=> Thu Mar 06 2014 23:05:21 GMT+0000 (GMT)

d.monthName();
//=> 'Mar'

var dateValue = Date();
       var month = dateValue.substring(4,7);
       var date = dateValue.substring(8,10);
       var year = dateValue.substring(20,24);
       var finaldateString = date+"-"+month+"-"+year;

var month=new Array(12);
month[0]="January";
month[1]="February";
month[2]="March";
month[3]="April";
month[4]="May";
month[5]="June";
month[6]="July";
month[7]="August";
month[8]="September";
month[9]="October";
month[10]="November";
month[11]="December";

document.write("The current month is " + month[d.getMonth()]);

$.datepicker.setDefaults( $.datepicker.regional[ "nl" ] );   // dutch
$.datepicker.formatDate( "dd MM yy", objDate );

var now = new Date();
var monthAbbrvName = now.toDateString().substring(4, 7);

const myDate = new Date()
const shortMonthName = moment(myDate).format('MMM') // Aug
const fullMonthName = moment(myDate).format('MMMM') // August

function testDateInfo() {
        var months = new Array();
        var days = new Array();
        var workingDate = new Date();
        workingDate.setHours(0, 0, 0, 0);
        workingDate.setDate(1);
        var RE = new RegExp("([a-z]+)","ig");
        //-- get day names 0-6
        for (var i = 0; i < 7; i++) {

            var day = workingDate.getDay();
            //-- will eventually be in order
            if (days[day] == undefined)
                days[day] = workingDate.toLocaleDateString().match(RE)[0];
            workingDate.setDate(workingDate.getDate() + 1);
        }
        //--get month names 0-11
        for (var i = 0; i < 12; i++) {
            workingDate.setMonth(i);
            months.push(workingDate.toLocaleDateString().match(RE)[1]);
        }
        alert(days.join(",") + " nr " + months.join(","));
    }

$.fn.getMonthName = function(date) {

    var monthNames = [
    "January", "February", "March",
    "April", "May", "June",
    "July", "August", "September",
    "October", "November", "December"
    ];

    return monthNames[date.getMonth()];

};

.config($mdDateLocaleProvider) {
    $mdDateLocaleProvider.formatDate = function(date) {
      if(date !== null) {
        if(date.getMonthName == undefined) {
          date.getMonthName = function() {
            var monthNames = [ "January", "February", "March", "April", "May", "June",
            "July", "August", "September", "October", "November", "December" ];
            return monthNames[this.getMonth()];
          }
        }
        var day = date.getDate();
        var monthIndex = date.getMonth();
        var year = date.getFullYear();
        return day + ' ' + date.getMonthName() + ' ' + year;
      }
    };
  }

Date.monthNames = function( ) {
var arrMonth = [],
    dateRef = new Date(),
    year = dateRef.getFullYear();

dateRef.setMonth(0);
while (year == dateRef.getFullYear()) {
    /* push le mois en lettre et passe au mois suivant */
    arrMonth.push( (dateRef.toLocaleString().split(' '))[2] );
    dateRef.setMonth( dateRef.getMonth() + 1);
}

return arrMonth;
}

alert(Date.monthNames().toString());

// -> janvier,février,mars,avril,mai,juin,juillet,août,septembre,octobre,novembre,décembre

kendo.toString(dateobject, "MMMM");