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Edit File: formatdate.js

// formatDate :
// a PHP date like function, for formatting date strings
// authored by Svend Tofte <www.svendtofte.com>
// the code is in the public domain
//
// see http://www.svendtofte.com/javascript/javascript-date-string-formatting/
// and http://www.php.net/date
//
// thanks to 
//  - Daniel Berlin <mail@daniel-berlin.de>,
//    major overhaul and improvements
//  - Matt Bannon,
//    correcting some stupid bugs in my days-in-the-months list!
//  - levon ghazaryan. pointing out an error in z switch.
//  - Andy Pemberton. pointing out error in c switch 
//
// input : format string
// time : epoch time (seconds, and optional)
//
// if time is not passed, formatting is based on 
// the current "this" date object's set time.
//
// supported switches are
// a, A, B, c, d, D, F, g, G, h, H, i, I (uppercase i), j, l (lowecase L), 
// L, m, M, n, N, O, P, r, s, S, t, U, w, W, y, Y, z, Z
// 
// unsupported (as compared to date in PHP 5.1.3)
// T, e, o

Date.prototype.formatDate = function (input,time) {
    
    var daysLong =    ["Sunday", "Monday", "Tuesday", "Wednesday", 
                       "Thursday", "Friday", "Saturday"];
    var daysShort =   ["Sun", "Mon", "Tue", "Wed", 
                       "Thu", "Fri", "Sat"];
    var monthsShort = ["Jan", "Feb", "Mar", "Apr",
                       "May", "Jun", "Jul", "Aug", "Sep",
                       "Oct", "Nov", "Dec"];
    var monthsLong =  ["January", "February", "March", "April",
                       "May", "June", "July", "August", "September",
                       "October", "November", "December"];

s : function () {
            // Seconds, with leading zeros
            var sec = String (date.getSeconds ());
            return (sec.length == 1 ? "0" + sec : sec);
        },        
        
        S : function () {
            // English ordinal suffix for the day of the month, 2 characters
            switch (date.getDate ()) {
                case  1: return ("st"); 
                case  2: return ("nd"); 
                case  3: return ("rd");
                case 21: return ("st"); 
                case 22: return ("nd"); 
                case 23: return ("rd");
                case 31: return ("st");
                default: return ("th");
            }
        },
        
        t : function () {
            // thanks to Matt Bannon for some much needed code-fixes here!
            var daysinmonths = [null,31,28,31,30,31,30,31,31,30,31,30,31];
            if (this.L()==1 && this.n()==2) return 29; // ~leap day
            return daysinmonths[this.n()];
        },
        
        U : function () {
            // Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)
            return Math.round(date.getTime()/1000);
        },

w : function () {
            // Numeric representation of the day of the week
            return date.getDay();
        },
        
        W : function () {
            // Weeknumber, as per ISO specification:
            // http://www.cl.cam.ac.uk/~mgk25/iso-time.html
        
            var DoW = this.N ();
            var DoY = this.z ();

// If the day is 3 days before New Year's Eve and is Thursday or earlier,
            // it's week 1 of next year.
            var daysToNY = 364 + this.L () - DoY;
            if (daysToNY <= 2 && DoW <= (3 - daysToNY)) {
                return 1;
            }

// If the day is within 3 days after New Year's Eve and is Friday or later,
            // it belongs to the old year.
            if (DoY <= 2 && DoW >= 5) {
                return new Date (this.Y () - 1, 11, 31).formatDate ("W");
            }
            
            var nyDoW = new Date (this.Y (), 0, 1).getDay ();
            nyDoW = nyDoW != 0 ? nyDoW - 1 : 6;

if (nyDoW <= 3) { // First day of the year is a Thursday or earlier
                return (1 + Math.floor ((DoY + nyDoW) / 7));
            } else {  // First day of the year is a Friday or later
                return (1 + Math.floor ((DoY - (7 - nyDoW)) / 7));
            }
        },
        
        y : function () {
            // A two-digit representation of a year
            var y = String(this.Y());
            return y.substring(y.length-2,y.length);
        },        
        
        Y : function () {
            // A full numeric representation of a year, 4 digits
    
            // we first check, if getFullYear is supported. if it
            // is, we just use that. ppks code is nice, but wont
            // work with dates outside 1900-2038, or something like that
            if (date.getFullYear) {
                var newDate = new Date("January 1 2001 00:00:00 +0000");
                var x = newDate .getFullYear();
                if (x == 2001) {              
                    // i trust the method now
                    return date.getFullYear();
                }
            }
            // else, do this:
            // codes thanks to ppk:
            // http://www.xs4all.nl/~ppk/js/introdate.html
            var x = date.getYear();
            var y = x % 100;
            y += (y < 38) ? 2000 : 1900;
            return y;
        },

z : function () {
            // The day of the year, zero indexed! 0 through 366
            var s = "January 1 " + this.Y() + " 00:00:00 GMT" + this.O();
            var t = new Date(s);
            var diff = date.getTime() - t.getTime();
            return Math.floor(diff/1000/60/60/24);
        },

Z : function () {
            // Timezone offset in seconds
            return (date.getTimezoneOffset () * -60);
        }        
    
    }

function getSwitch(str) {
        if (switches[str] != undefined) {
            return switches[str]();
        } else {
            return str;
        }
    }

var date;
    if (time) {
        var date = new Date (time);
    } else {
        var date = this;
    }

// Some (not all) predefined format strings from PHP 5.1.1, which 
// offer standard date representations.
// See: http://www.php.net/manual/en/ref.datetime.php#datetime.constants
//

// Atom      "2005-08-15T15:52:01+00:00"
Date.DATE_ATOM    = "Y-m-d%TH:i:sP";
// ISO-8601  "2005-08-15T15:52:01+0000"
Date.DATE_ISO8601 = "Y-m-d%TH:i:sO";
// RFC 2822  "Mon, 15 Aug 2005 15:52:01 +0000"
Date.DATE_RFC2822 = "D, d M Y H:i:s O";
// W3C       "2005-08-15 15:52:01+00:00"
Date.DATE_W3C     = "Y-m-d%TH:i:sP";