Pass in an ISO-8601 date string and get back an object containing the date details

dateMap.js

// Example Usage: http://codepen.io/o0110o/pen/gpdKYp

/**
 * Pad
 * @param {String}
 * @param {String}
 * @param {Integer}
 * @return {String}
 */
// Borrowed from: https://github.com/o0110o/meta-js/blob/master/src/util.js
_pad = function (str, pad, width) {
    // Fallbacks
    pad = pad || '0';
    str = str + '';
    // Add the padding
    while (str.length < width) {
        str = pad + str;
    }
    return str;
}

/**
* DateMap
* @param {String}
* @param {String}
* @return {Object}
*/
var _dateMap = function (date, mode) {
    // Months and days
    months = ['January', 'Febuary', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
    shortMonths = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
    weekdays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
    shortWeekdays = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],

    checkDate = new Date(date);
    modeMatch = /standard|std|military|mil/i.test(date);
    // Get the current time related data returned in an object
    if ((typeof date !== 'undefined' && date.substring) || !date) {
        // Get the current time related data returned in an object
        if (!date || modeMatch) {
            // Under the right conditions, set mode to the value of date
            if (!mode && modeMatch) {
                mode = date;
            };
            date = new Date(Date.now());
        } else {
            date = new Date(date); // Appending UTC converts the str to GMT... Go figure.
        }

        // Fallback to military mode by default
        mode = mode || 'military';

        // Used in date object
        getDay = date.getDay();
        getMS = (new Date).getMilliseconds();
        getDate = date.getDate();
        getMonth = date.getMonth();
        getFullYear = date.getFullYear();
        getHours = date.getHours();
        getMinutes = date.getMinutes();
        getSeconds = date.getSeconds();
        timezone = -(new Date().getTimezoneOffset() / 60);

        // Date object
        dateObj = {
            'D': getDate,
            'DD': _pad(getDate, '0', 2),
            'M': getMonth + 1,
            'MM': _pad(getMonth + 1, '0', 2),
            'MMM': shortMonths[getMonth],
            'MMMM': months[getMonth],
            'YYYY': getFullYear,
            'd': (getDay + 1),
            'dd': _pad((getDay + 1), '0', 2),
            'ddd': shortWeekdays[getDay],
            'dddd': weekdays[getDay],
            'h': getHours,
            'hh': _pad(getHours, '0', 2),
            'm': getMinutes,
            'mm': _pad(getMinutes, '0', 2),
            's': getSeconds,
            'ss': _pad(getSeconds, '0', 2),
            'ms': getMS,
            'ZZ': timezone,
            'PP': 'PM',
            'pp': 'pm'
        }

        // AM/PM
        if (dateObj.h > 12) {
            if (dateObj.h === 24) {
                dateObj.PP = 'AM';
                dateObj.pp = 'am';
            }            
        } else if (dateObj.h < 12) {
            dateObj.PP = 'AM';
            dateObj.pp = 'am';
        };

        // Set milliseconds to null if not getting current time via Date.now()
        if ((checkDate !== "Invalid Date" && !isNaN(checkDate))) {
            dateObj.ms = null;
        };
        // Use 12-hour mode
        if (mode === 'standard') {
            dateObj.hh = dateObj.h;
            diff = dateObj.h - 12;

            if (dateObj.h > 12) {
                dateObj.h = dateObj.hh = diff;
                
            } else if (dateObj.h < 10) {
                dateObj.hh = _pad(dateObj.h, '0', 2);
            };
        }

        return dateObj;
    }
}