format does not work correctly

[tandvu]

If I defined format = 'MMMM Do, YYYY" then it works fine.

But if I defined format = '{{format}}' and I defined $scope.format = 'MMMM Do, YYYY", then it display September 10o, 2013-September 25o, 2013 after I select the new range.

There are many other odd behaviors when you use a variable to define the format.

Tan