JS date format

// Simulates PHP's date function, ported to lutil from http://jacwright.com/projects/javascript/date_format/
exports.dateFormat = function(date, format) {
    var returnStr = '';
    
    var replace = {
        shortMonths: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
        longMonths: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
        shortDays: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
        longDays: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],

        // Day
        d: function() { return (date.getDate() < 10 ? '0' : '') + date.getDate(); },
        D: function() { return date.shortDays[date.getDay()]; },
        j: function() { return date.getDate(); },
        l: function() { return Date.replaceChars.longDays[date.getDay()]; },
        N: function() { return date.getDay() + 1; },
        S: function() { return (date.getDate() % 10 == 1 && date.getDate() != 11 ? 'st' : (date.getDate() % 10 == 2 && date.getDate() != 12 ? 'nd' : (date.getDate() % 10 == 3 && date.getDate() != 13 ? 'rd' : 'th'))); },
        w: function() { return date.getDay(); },
        z: function() { var d = new Date(date.getFullYear(),0,1); return Math.ceil((this - d) / 86400000); }, // Fixed now
        // Week
        W: function() { var d = new Date(date.getFullYear(), 0, 1); return Math.ceil((((this - d) / 86400000) + d.getDay() + 1) / 7); }, // Fixed now
        // Month
        F: function() { return Date.replaceChars.longMonths[date.getMonth()]; },
        m: function() { return (date.getMonth() < 9 ? '0' : '') + (date.getMonth() + 1); },
        M: function() { return Date.replaceChars.shortMonths[date.getMonth()]; },
        n: function() { return date.getMonth() + 1; },
        t: function() { var d = new Date(); return new Date(d.getFullYear(), d.getMonth(), 0).getDate(); }, // Fixed now, gets #days of date
        // Year
        L: function() { var year = date.getFullYear(); return (year % 400 === 0 || (year % 100 !== 0 && year % 4 === 0)); },   // Fixed now
        o: function() { var d  = new Date(date.valueOf());  d.setDate(d.getDate() - ((date.getDay() + 6) % 7) + 3); return d.getFullYear();}, //Fixed now
        Y: function() { return date.getFullYear(); },
        y: function() { return ('' + date.getFullYear()).substr(2); },
        // Time
        a: function() { return date.getHours() < 12 ? 'am' : 'pm'; },
        A: function() { return date.getHours() < 12 ? 'AM' : 'PM'; },
        B: function() { return Math.floor((((date.getUTCHours() + 1) % 24) + date.getUTCMinutes() / 60 + date.getUTCSeconds() / 3600) * 1000 / 24); }, // Fixed now
        g: function() { return date.getHours() % 12 || 12; },
        G: function() { return date.getHours(); },
        h: function() { return ((date.getHours() % 12 || 12) < 10 ? '0' : '') + (date.getHours() % 12 || 12); },
        H: function() { return (date.getHours() < 10 ? '0' : '') + date.getHours(); },
        i: function() { return (date.getMinutes() < 10 ? '0' : '') + date.getMinutes(); },
        s: function() { return (date.getSeconds() < 10 ? '0' : '') + date.getSeconds(); },
        u: function() { var m = date.getMilliseconds(); return (m < 10 ? '00' : (m < 100 ?
    '0' : '')) + m; },
        // Timezone
        e: function() { return "Not Yet Supported"; },
        I: function() { return "Not Yet Supported"; },
        O: function() { return (-date.getTimezoneOffset() < 0 ? '-' : '+') + (Math.abs(date.getTimezoneOffset() / 60) < 10 ? '0' : '') + (Math.abs(date.getTimezoneOffset() / 60)) + '00'; },
        P: function() { return (-date.getTimezoneOffset() < 0 ? '-' : '+') + (Math.abs(date.getTimezoneOffset() / 60) < 10 ? '0' : '') + (Math.abs(date.getTimezoneOffset() / 60)) + ':00'; }, // Fixed now
        T: function() { var m = date.getMonth(); date.setMonth(0); var result = date.toTimeString().replace(/^.+ \(?([^\)]+)\)?$/, '$1'); date.setMonth(m); return result;},
        Z: function() { return -date.getTimezoneOffset() * 60; },
        // Full Date/Time
        c: function() { return date.format("Y-m-d\\TH:i:sP"); }, // Fixed now
        r: function() { return date.toString(); },
        U: function() { return date.getTime() / 1000; }
    };
    
    for (var i = 0; i < format.length; i++) {       
        var curChar = format.charAt(i);         
        if (i - 1 >= 0 && format.charAt(i - 1) == "\\") {
            returnStr += curChar;
        }
        else if (replace[curChar]) {
            returnStr += replace[curChar].call(this);
        } else if (curChar != "\\"){
            returnStr += curChar;
        }
    }
    
    return returnStr;
};