Takes a native date object and returns string containing date the specified format

get_formatted_date.js

/*
Takes a native date object and returns string containing date the specified format
Format segments are 
{{dd}} - 2 digit date
{{D}} - Day of week
{{mm}} - 2 digit month
{{mmm}} - 3 letter month
{{MMM}} - Full month
{{yyyy}} - 4 digit year
{{H}} - 2 digit hour (24 hours)
{{h}} - 2 digit hour (12 hours)
{{i}} - 2 digit minutes
{{a}} - am or pm
{{A}} - AM or pm
*/
function get_formatted_date(date_obj,format){
    var req_format = format||"{{mmm}} {{dd}}";
    var t = "am";
    if(typeof(date_obj)=="undefined"){return "";}
    if(date_obj.toString() == "Invalid Date"){return "";}
    var required_functions = ["getDate","getMonth"];
    for (var i = required_functions.length - 1; i >= 0; i--) {
        if(typeof(date_obj[required_functions[i]])=="undefined"){return "";}
    }
    var months = ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"];
    var months_full = ["January","February","March","April","May","June","July","August","September","October","November","December"];
    var days = ["Sun","Mon","Tue","Wed","Thu","Fri","Sat"];
    req_format = req_format.replace(/\{\{mmm\}\}/g, months[date_obj.getMonth()]);
    req_format = req_format.replace(/\{\{MMM\}\}/g, months_full[date_obj.getMonth()]);
    req_format = req_format.replace(/\{\{mm\}\}/g, ("0"+(date_obj.getMonth() + 1)).slice(-2));
    req_format = req_format.replace(/\{\{dd\}\}/g, ("0"+date_obj.getDate()).slice(-2));
    req_format = req_format.replace(/\{\{D\}\}/g, days[date_obj.getDay()]);
    req_format = req_format.replace(/\{\{yyyy\}\}/g, date_obj.getFullYear());
    req_format = req_format.replace(/\{\{H\}\}/g, ("0" + date_obj.getHours()).slice(-2));
    req_format = req_format.replace(/\{\{h\}\}/g, date_obj.getHours() > 12 ? date_obj.getHours() - 12 : date_obj.getHours() == 0 ? "12" : date_obj.getHours());
    req_format = req_format.replace(/\{\{i\}\}/g, ("0" + date_obj.getMinutes()).slice(-2));
    if(date_obj.getHours() > 12){t = "pm"}
    req_format = req_format.replace(/\{\{a\}\}/g, t);
    req_format = req_format.replace(/\{\{A\}\}/g, t.toUpperCase());
    return req_format;
};