Count days until today moment.js

Question

I have a function that gets the number of days until today. It works however, I am using moment.js to write and format the date from JSON data and I think it is causing a conflict. Is there a way to do the same thing using moment.js?

This is the working JavaScript: http://jsfiddle.net/infatti/XeqPT/

// Count days due function daysUntil(year, month, day) {   var now = new Date(),       dateEnd = new Date(year, month - 1, day), // months are zero-based       days = (dateEnd - now) / 1000/60/60/24;   // convert milliseconds to days    return Math.round(days); } 

How can the same thing be done using moment.js?

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If interested, here is how I am pulling in the date when it does not work.

<span class="due-date" data-bind="textualDate: DueDate"></span>  ko.bindingHandlers.textualDate = {     update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {         var valueUnwrapped = ko.utils.unwrapObservable(valueAccessor());         var textContent = moment(valueUnwrapped).format("MM/DD/YYYY");         ko.bindingHandlers.text.update(element, function () { return textContent; });     } }; 

Answer 1

If the problem you have is to use moment.js to get the duration between two dates, then you can use the diff function like this:

var a = moment([2007, 0, 29]); var b = moment([2007, 0, 28]); var diffInMs = a.diff(b); // 86400000 milliseconds var diffInDays = a.diff(b, 'days'); // 1 day 

Now, I don't know if you have any problem with KnockoutJS, but this should ensure that your computation is done with moment.js.

Just for your interest, I made myself a custom binding handler for displaying a moment date some time ago. The difference with yours is that my observable was already a moment object. So, I've modified it down here to make it work with standard date objects:

    ko.bindingHandlers.moment = {         update: function(element, valueAccessor) {             var value = valueAccessor();             var formattedValue = moment(ko.utils.unwrapObservable(value)).format('MM/DD/YYYY');             $(element).text(formattedValue);         }     }; 

Edit: I made you a fiddle with the example.