Format Multiple Dates in Javascript

README.mkd

• php: http://php.net/manual/en/function.date.php
• .net: http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx
• bash: http://ss64.com/bash/date.html
• emacs: format-time-string

datehelper.js

/**
 *<code>
var date = new Date();
var date2 = new Date();
date2.setMonth(date2.getMonth() + 2);

console.log(date, date2);
console.log('getDays:\t\t',datehelper.getDays(date, date2));
for(var n in datehelper) {
    if(/get\w+Of/.test(n)) {
        console.log(n + ":\t", datehelper[n](date));
    }
}
</code>
 */
var datehelper = {
    getDays: function(date1, date2, offset) {
        return (date2.getTime() - date1.getTime()) / (24*3600*1000) + 1 + (offset | 0);
    },
    createDateFunction: function(date, dayofmonth, month) {
        var newDate = new Date(date);
        typeof month != 'undefined' && newDate.setMonth(month);
        newDate.setDate(dayofmonth);
        return newDate;
    },
    getFirstDayOfWeek: function(date) {
        return this.createDateFunction(date, date.getDate() - date.getDay());
    },
    getLastDayOfWeek: function(date) {
        return this.createDateFunction(date, date.getDate() + 6 - date.getDay());
    },
    getFirstDayOfMonth: function(date) {
        return this.createDateFunction(date, 1);
    },
    getLastDayOfMonth: function(date) {
        return this.createDateFunction(date, 0, date.getMonth() + 1);
    },
    getFirstDayOfQuarter: function(date) {
        return this.createDateFunction(date, 1, date.getMonth() - (date.getMonth() % 3));
    },
    getLastDayOfQuarter: function(date) {
        return this.createDateFunction(date, 0, date.getMonth() + (3 - (date.getMonth() % 3)));
    }
};

formatdates.js

/**
 * Format mutiple dates
 */
var utils = utils || {};
utils.formatDate = function(mask, date1, date2) {
    if(Object.prototype.toString.call(date1) != '[object Date]') {
        date1 = new Date(date1);
        date2 = new Date(date2);
    }
    var formatters = this.dateFormatters, date = date1;
    return mask.replace(/([a-zA-Z])\1{0,3}|\|/g, function(flag) {
        if(flag == '|') { date = date2; return ''; }
        return flag in formatters ? formatters[flag](date) : flag;
    });
};
utils.dateFormatters = function() {
    function pad(n) { return ('0' + n).substr(-2); }
    return {
        yy: function(d) { return pad(d.getFullYear()); },
        yyyy: function(d) { return d.getFullYear(); },
        M: function(d) { return d.getMonth() + 1; },
        MM: function(d) { return pad(d.getMonth() + 1); },
        d: function(d) { return d.getDate(); },
        dd: function(d) { return pad(d.getDate()); },
        HH: function(d) { return pad(d.getHours()); },
        mm: function(d) { return pad(d.getMinutes()); },
        ss: function(d) { return pad(d.getSeconds()); }
    }
}();

utils.dateFormatters.i18n = { lang: typeof navigator != 'undefined' && navigator.language };
utils.dateFormatters.i18n.monthNames = {
    "zh-CN" : ["1月", "2月", "3月", "4月", "5月", "6月", "7月", "8月", "9月", "10月", "11月", "12月"],
    "en-US": ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
};
utils.dateFormatters.MMM = function(d) {
    return this.i18n.monthNames[this.i18n.lang || 'en-US'][d.getMonth()];
};

var d1 = new Date(), d2 = new Date(d1);
d2.setDate(d2.getDate() + 6);
console.log(utils.formatDate('yyyy/M/d - |M/d', d1, d2));