Adding days to given date in jQuery

date, jquery

Solution

NaN stands for `Not a Number` - This means that the users input is invalid.

You could check to see if the input is valid by using `if(!isNaN(date.getTime())){`

Some code to get you started:

;(function($, window, document, undefined){
    $("#days").on("change", function(){
       var date = new Date($("#start_date").val()),
           days = parseInt($("#days").val(), 10);

        if(!isNaN(date.getTime())){
            date.setDate(date.getDate() + days);

            $("#end_date").val(date.toInputFormat());
        } else {
            alert("Invalid Date");  
        }
    });


    //From: http://stackoverflow.com/questions/3066586/get-string-in-yyyymmdd-format-from-js-date-object
    Date.prototype.toInputFormat = function() {
       var yyyy = this.getFullYear().toString();
       var mm = (this.getMonth()+1).toString(); // getMonth() is zero-based
       var dd  = this.getDate().toString();
       return yyyy + "-" + (mm[1]?mm:"0"+mm[0]) + "-" + (dd[1]?dd:"0"+dd[0]); // padding
    };
})(jQuery, this, document);

http://jsfiddle.net/MCzJ6/1

Hope this helps.

W

Problem

I have a form with three fields, "start_date", "days", "end_date". I would like to get the end date by adding days to the start date. My jQuery code is: ``` $("#days").change(function(){ var start_date = new Date($("#start_date").attr('value')); var days = parseInt($("#days").attr('value'))-1; var end_date = new Date(start_date); end_date.setDate(start_date.getDate() + days); $("#end_date").val(end_date.getFullYear() + '-' + ("0" + (end_date.getMonth() + 1)).slice(-2) + '-' + ("0" + end_date.getDate()).slice(-2)); }); ``` In the "end_date" field I get "NaN-aN-aN". What am I doing wrong?

Original source

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