getFormattedDate

var gsMonthNames = new Array(
'January',
'February',
'March',
'April',
'May',
'June',
'July',
'August',
'September',
'October',
'November',
'December'
);

var gsDayNames = new Array(
'Sunday',
'Monday',
'Tuesday',
'Wednesday',
'Thursday',
'Friday',
'Saturday'
);

var d = new Date(par[0] * 1000);
var f = par[1];

var formatteddate = f.replace(/(yyyy|yy|mmmm|mmm|mm|dddd|ddd|dd|hh|nn|ss|a\/p)/gi,
    function($1)
    {
        switch ($1)
        {
        case 'yyyy': return d.getFullYear();
        case 'yy':   return ('0' + d.getFullYear()).slice(-2);
        case 'mmmm': return gsMonthNames[d.getMonth()];
        case 'mmm':  return gsMonthNames[d.getMonth()].slice(0,3);
        case 'mm':   return ('0' + (d.getMonth() + 1)).slice(-2);
        case 'dddd': return gsDayNames[d.getDay()];
        case 'ddd':  return gsDayNames[d.getDay()].slice(0,3);
        case 'dd':   return ('0' + d.getDate()).slice(-2);
        case 'hh':   return ('0' + ((h = d.getHours() % 12) ? h : 12)).slice(-2);
        case 'HH':   return ('0' + d.getHours()).slice(-2);
        case 'nn':   return ('0' + d.getMinutes()).slice(-2);
        case 'ss':   return ('0' + d.getSeconds()).slice(-2);
        case 'a/p':  return d.getHours() < 12 ? 'a' : 'p';
        }
    }
);