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POWhy is my date an Invalid Date
 

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  1. POWhy is my date an Invalid Date
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    <p>I am attempting to work out the date difference between two date objects in JavaScript. However, when I attempt to utilise the <code>Math.round</code> function I get <code>NaN</code>.</p> <p>The problem appears on the this line</p> <pre><code>var deliveryDays = Math.round(Math.abs((currentDate.getTime() - basketDate.getTime())/(oneDay))); </code></pre> <p>Please see the following code:</p> <pre><code> function datePicker() { $('#datePicker').datepicker(); $('.ui-datepicker').addClass('datePicker'); //This is added to the class ui-datepicker which is generated when the date picker is generated. var currentDate = $.datepicker.formatDate('dd-mm-yy', new Date()); // Get today's date. currentDate = new Date(currentDate); // Convert string to date (string must be an appropriate format. $("#datePickerConfirmation").click(function () { var basketDate = $('#datePicker').datepicker('getDate'); basketDate = $.datepicker.formatDate('dd-mm-yy', new Date(basketDate)); // Changes the date format to dd-mm-yyyy. basketDate = new Date(basketDate); // This block works out the difference between the current date and the selected date. var oneDay = 24 * 60 * 60 * 1000; var deliveryDays = Math.round(Math.abs((currentDate.getTime() - basketDate.getTime()) / (oneDay))); basketDate = basketDate.toString(); currentDate = currentDate.toString(); deliveryDays = deliveryDays; var result = window.confirm('Confirm Date: ' + basketDate + '\n \nDays to Delivery: ' + deliveryDays); if (result == true) { console.log("User pressed Ok / Confirm Date set to: " + basketDate); // Do nothing } else { console.log("User pressed Cancel, basket set to null"); basketDate = null; console.log(basketDate); } }); } </code></pre>
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    1. USPaul D. Waite
    1. USNikolai5
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    1. COTake a look [here](http://stackoverflow.com/questions/17064540/date-function-not-working-in-ie8/17064680#17064680) for details. Anyway you format a date as "dd-mm-yyyy" but this MAY not be the format Date constructor accept...just remove line where you format Date to string then convert back to Date...
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      1. POWhy is my date an Invalid Date
      1. USAdriano Repetti
 

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