Given a date (m/d/yyyy) determine if its "the third tuesday" of the month etc [duplicate]

Question

After several searches, I haven't been able to find what I'm looking for. Im using jquery datepicker to return a date string that looks like Day, Month Date, YYYY, and I am looking for a library or some method that will take that and turn it into the second Tuesday of the month, or the fourth Thursday of the month. So far it seems like jquery's prettyDate and EasyDate dont have the functionality I'm looking for, and I would love to avoid doing this by hand!

Thanks, Alex

Answer 1

You don't need a date library - just take the date, divide by 7 and round up.

//format: Day, Month Date, YYYY
var ordinals = ["", "first", "second", "third", "fourth", "fifth"];
var date = "Friday, May 10, 2013";
var tokens = date.split(/[ ,]/);
// tokens = ["Friday", "", "May", "10", "", "2013"];
console.log( "The " + ordinals[Math.ceil(tokens[3]/7)] + " " + tokens[0] + " of the month");

Answer 2

function nthDay(D){
    var nth= ['First', 'Second', 'Third', 'Fourth', 'Fifth'], 
    dayNames= ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 
    'Thursday', 'Friday', 'Saturday'], 
    monthNames= ['January', 'February', 'March', 'April', 'May', 'June', 
    'July', 'August', 'September', 'October', 'November', 'December'];

    return nth[Math.floor(D.getDate()/7)]+'  '+
    dayNames[D.getDay()]+' of '+monthNames[D.getMonth()];
}

nthDay(new Date(2013, 4, 10))

/* returned value: Second Friday of May */