Holidays plugin for Moment.JS

moment-holidays.js

//## Moment.JS Holiday Plugin
//
//Usage:
//  Call .holiday() from any moment object. If date is a US Federal Holiday, name of the holiday will be returned.
//  Otherwise, return nothing.
//
//  Example:
//    `moment('12/25/2013').holiday()` will return "Christmas Day"
//
//Holidays:
//  You can configure holiday bellow. The 'M' stands for Month and represents fixed day holidays.
//  The 'W' stands for Week, and represents holidays with date based on week day rules.
//  Example: '10/2/1' Columbus Day (Second monday of october).
//
//License:
//  Copyright (c) 2013 [Jr. Hames](http://jrham.es) under [MIT License](http://opensource.org/licenses/MIT)
(function() {
    var moment;

    moment = typeof require !== "undefined" && require !== null ? require("moment") : this.moment;

    //Holiday definitions
    var _holidays = {
    'M': {//Month, Day
            '01/01': "New Year's Day",
            '01/02': "New Year's Day (observed)",
            '07/04': "Independence Day",
            '11/11': "Veteran's Day",
            '12/24': "Christmas Eve",
            '12/25': "Christmas Day",
            '12/31': "New Year's Eve"
        },
        'W': {//Month, Week of Month, Day of Week
            '1/3/1': "Martin Luther King Jr. Day",
            '2/3/1': "Washington's Birthday",
            '5/5/1': "Memorial Day",
            '9/1/1': "Labor Day",
            '10/2/1': "Columbus Day",
            '11/4/4': "Thanksgiving Day",
            '11/4/5': "Day after Thanksgiving"
        }
    };

    moment.fn.holiday = function() {
        var diff = 1+ (0 | (this._d.getDate() - 1) / 7),
            memorial = (this._d.getDay() === 1 && (this._d.getDate() + 7) > 30) ? "5" : null;

        return (_holidays['M'][this.format('MM/DD')] || _holidays['W'][this.format('M/'+ (memorial || diff) +'/d')]);
    };

    if ((typeof module !== "undefined" && module !== null ? module.exports : void 0) != null) {
        module.exports = moment;
    }

}(this));