Javascript - Format date like PHP // source http://jsbin.com/vejujohiqu

README.md

This enables the use of formatting your date in Javascript like how you are used to in PHP

Original source: http://jacwright.com/projects/javascript/date_format/

date.format.js

// Simulates PHP's date function
Date.prototype.format = function(format) {
    var returnStr = '';
    var replace = Date.replaceChars;
    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;
};

Date.replaceChars = {
    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 (this.getDate() < 10 ? '0' : '') + this.getDate(); },
    D: function() { return Date.replaceChars.shortDays[this.getDay()]; },
    j: function() { return this.getDate(); },
    l: function() { return Date.replaceChars.longDays[this.getDay()]; },
    N: function() { return this.getDay() + 1; },
    S: function() { return (this.getDate() % 10 == 1 && this.getDate() != 11 ? 'st' : (this.getDate() % 10 == 2 && this.getDate() != 12 ? 'nd' : (this.getDate() % 10 == 3 && this.getDate() != 13 ? 'rd' : 'th'))); },
    w: function() { return this.getDay(); },
    z: function() { var d = new Date(this.getFullYear(),0,1); return Math.ceil((this - d) / 86400000); }, // Fixed now
    // Week
    W: function() { var d = new Date(this.getFullYear(), 0, 1); return Math.ceil((((this - d) / 86400000) + d.getDay() + 1) / 7); }, // Fixed now
    // Month
    F: function() { return Date.replaceChars.longMonths[this.getMonth()]; },
    m: function() { return (this.getMonth() < 9 ? '0' : '') + (this.getMonth() + 1); },
    M: function() { return Date.replaceChars.shortMonths[this.getMonth()]; },
    n: function() { return this.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 = this.getFullYear(); return (year % 400 == 0 || (year % 100 != 0 && year % 4 == 0)); },   // Fixed now
    o: function() { var d  = new Date(this.valueOf());  d.setDate(d.getDate() - ((this.getDay() + 6) % 7) + 3); return d.getFullYear();}, //Fixed now
    Y: function() { return this.getFullYear(); },
    y: function() { return ('' + this.getFullYear()).substr(2); },
    // Time
    a: function() { return this.getHours() < 12 ? 'am' : 'pm'; },
    A: function() { return this.getHours() < 12 ? 'AM' : 'PM'; },
    B: function() { return Math.floor((((this.getUTCHours() + 1) % 24) + this.getUTCMinutes() / 60 + this.getUTCSeconds() / 3600) * 1000 / 24); }, // Fixed now
    g: function() { return this.getHours() % 12 || 12; },
    G: function() { return this.getHours(); },
    h: function() { return ((this.getHours() % 12 || 12) < 10 ? '0' : '') + (this.getHours() % 12 || 12); },
    H: function() { return (this.getHours() < 10 ? '0' : '') + this.getHours(); },
    i: function() { return (this.getMinutes() < 10 ? '0' : '') + this.getMinutes(); },
    s: function() { return (this.getSeconds() < 10 ? '0' : '') + this.getSeconds(); },
    u: function() { var m = this.getMilliseconds(); return (m < 10 ? '00' : (m < 100 ?
'0' : '')) + m; },
    // Timezone
    e: function() { return "Not Yet Supported"; },
    I: function() {
        var DST = null;
            for (var i = 0; i < 12; ++i) {
                    var d = new Date(this.getFullYear(), i, 1);
                    var offset = d.getTimezoneOffset();

                    if (DST === null) DST = offset;
                    else if (offset < DST) { DST = offset; break; }                     else if (offset > DST) break;
            }
            return (this.getTimezoneOffset() == DST) | 0;
        },
    O: function() { return (-this.getTimezoneOffset() < 0 ? '-' : '+') + (Math.abs(this.getTimezoneOffset() / 60) < 10 ? '0' : '') + (Math.abs(this.getTimezoneOffset() / 60)) + '00'; },
    P: function() { return (-this.getTimezoneOffset() < 0 ? '-' : '+') + (Math.abs(this.getTimezoneOffset() / 60) < 10 ? '0' : '') + (Math.abs(this.getTimezoneOffset() / 60)) + ':00'; }, // Fixed now
    T: function() { var m = this.getMonth(); this.setMonth(0); var result = this.toTimeString().replace(/^.+ \(?([^\)]+)\)?$/, '$1'); this.setMonth(m); return result;},
    Z: function() { return -this.getTimezoneOffset() * 60; },
    // Full Date/Time
    c: function() { return this.format("Y-m-d\\TH:i:sP"); }, // Fixed now
    r: function() { return this.toString(); },
    U: function() { return this.getTime() / 1000; }
};

date.format.min.js

// Simulates PHP's date function
Date.prototype.format=function(e){var t="";var n=Date.replaceChars;for(var r=0;r<e.length;r++){var i=e.charAt(r);if(r-1>=0&&e.charAt(r-1)=="\\"){t+=i}else if(n[i]){t+=n[i].call(this)}else if(i!="\\"){t+=i}}return t};Date.replaceChars={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"],d:function(){return(this.getDate()<10?"0":"")+this.getDate()},D:function(){return Date.replaceChars.shortDays[this.getDay()]},j:function(){return this.getDate()},l:function(){return Date.replaceChars.longDays[this.getDay()]},N:function(){return this.getDay()+1},S:function(){return this.getDate()%10==1&&this.getDate()!=11?"st":this.getDate()%10==2&&this.getDate()!=12?"nd":this.getDate()%10==3&&this.getDate()!=13?"rd":"th"},w:function(){return this.getDay()},z:function(){var e=new Date(this.getFullYear(),0,1);return Math.ceil((this-e)/864e5)},W:function(){var e=new Date(this.getFullYear(),0,1);return Math.ceil(((this-e)/864e5+e.getDay()+1)/7)},F:function(){return Date.replaceChars.longMonths[this.getMonth()]},m:function(){return(this.getMonth()<9?"0":"")+(this.getMonth()+1)},M:function(){return Date.replaceChars.shortMonths[this.getMonth()]},n:function(){return this.getMonth()+1},t:function(){var e=new Date;return(new Date(e.getFullYear(),e.getMonth(),0)).getDate()},L:function(){var e=this.getFullYear();return e%400==0||e%100!=0&&e%4==0},o:function(){var e=new Date(this.valueOf());e.setDate(e.getDate()-(this.getDay()+6)%7+3);return e.getFullYear()},Y:function(){return this.getFullYear()},y:function(){return(""+this.getFullYear()).substr(2)},a:function(){return this.getHours()<12?"am":"pm"},A:function(){return this.getHours()<12?"AM":"PM"},B:function(){return Math.floor(((this.getUTCHours()+1)%24+this.getUTCMinutes()/60+this.getUTCSeconds()/3600)*1e3/24)},g:function(){return this.getHours()%12||12},G:function(){return this.getHours()},h:function(){return((this.getHours()%12||12)<10?"0":"")+(this.getHours()%12||12)},H:function(){return(this.getHours()<10?"0":"")+this.getHours()},i:function(){return(this.getMinutes()<10?"0":"")+this.getMinutes()},s:function(){return(this.getSeconds()<10?"0":"")+this.getSeconds()},u:function(){var e=this.getMilliseconds();return(e<10?"00":e<100?"0":"")+e},e:function(){return"Not Yet Supported"},I:function(){var e=null;for(var t=0;t<12;++t){var n=new Date(this.getFullYear(),t,1);var r=n.getTimezoneOffset();if(e===null)e=r;else if(r<e){e=r;break}else if(r>e)break}return this.getTimezoneOffset()==e|0},O:function(){return(-this.getTimezoneOffset()<0?"-":"+")+(Math.abs(this.getTimezoneOffset()/60)<10?"0":"")+Math.abs(this.getTimezoneOffset()/60)+"00"},P:function(){return(-this.getTimezoneOffset()<0?"-":"+")+(Math.abs(this.getTimezoneOffset()/60)<10?"0":"")+Math.abs(this.getTimezoneOffset()/60)+":00"},T:function(){var e=this.getMonth();this.setMonth(0);var t=this.toTimeString().replace(/^.+ \(?([^\)]+)\)?$/,"$1");this.setMonth(e);return t},Z:function(){return-this.getTimezoneOffset()*60},c:function(){return this.format("Y-m-d\\TH:i:sP")},r:function(){return this.toString()},U:function(){return this.getTime()/1e3}}

index.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<script src="date.format.min.js"></script>
<script id="jsbin-javascript">
var myDate = new Date();
alert(myDate.format('M jS, Y \\i\\s \\h\\e\\r\\e!'));
</script>
</body>
</html>