Descending order by date filter in AngularJs

According to documentation you can use the reverse argument.

filter:orderBy(array, expression[, reverse]);

Change your filter to:

orderBy: 'created_at':true

And a code example:

<div ng-app>
    <div ng-controller="FooController">
        <ul ng-repeat="item in items | orderBy:'num':true">
            <li>{{item.num}} :: {{item.desc}}</li>
        </ul>
    </div>
</div>

And the JavaScript:

function FooController($scope) {
    $scope.items = [
        {desc: 'a', num: 1},
        {desc: 'b', num: 2},
        {desc: 'c', num: 3},
    ];
}

Will give you:

3 :: c
2 :: b
1 :: a

On JSFiddle: http://jsfiddle.net/agjqN/

Perhaps this can be useful for someone:

In my case, I was getting an array of objects, each containing a date set by Mongoose.

I used:

ng-repeat="comment in post.comments | orderBy : sortComment : true"

And defined the function:

$scope.sortComment = function(comment) {
    var date = new Date(comment.created);
    return date;
};

This worked for me.

You can prefix the argument in orderBy with a '-' to have descending order instead of ascending. I would write it like this:

<div class="recent" 
   ng-repeat="reader in book.reader | orderBy: '-created_at' | limitTo: 1">
</div>

This is also stated in the documentation for the filter orderBy.