fix($formatters): Use model format first when parsing strings stored in the model.

The use the model format first (rather than input format) when parsing and formatting dates stored as strings in the model. This allows the model to contain 09/01/2016 (MM/DD/YYYY) and display as the more rational 01/09/2016 (DD/MM/YYYY)

fixes #22

Author: dalelotts

src/dateTimeInput.js

@@ -112,6 +112,7 @@
       var modelType = (attrs.modelType || 'Date')
 
       var inputFormats = [attrs.dateTimeInput, modelType].concat(scope.dateFormats).concat([moment.ISO_8601]).filter(unique)
+      var formatterFormats = [modelType].concat(inputFormats).filter(unique)
 
       // Behaviors
       controller.$parsers.unshift(dateTimeParserFactory(modelType, inputFormats, dateParseStrict))
@@ -146,7 +147,7 @@
         } else if (angular.isNumber(modelValue)) {
           return moment.utc(modelValue).format(displayFormat)
         }
-        return moment(modelValue, inputFormats, moment.locale(), dateParseStrict).format(displayFormat)
+        return moment(modelValue, formatterFormats, moment.locale(), dateParseStrict).format(displayFormat)
       }
 
       function applyFormatters () {

test/en/modelType.spec.js

@@ -340,6 +340,15 @@ describe('modelType', function () {
       expect(element.val()).toBe('Invalid date')
     })
 
+    it('model and display format can be different and ambiguous', function () {
+      $rootScope.date = '11/12/2016'
+
+      var element = $compile('<input data-date-time-input="DD/MM/YYYY" data-ng-model="date" data-model-type="MM/DD/YYYY">')($rootScope)
+      $rootScope.$digest()
+
+      expect(element.val()).toBe('12/11/2016')
+    })
+
     it('is valid if user deletes input', function () {
       var element = $compile('<input data-date-time-input="M/D/YYYY" data-ng-model="date" data-model-type="YYYY-MM-DD">')($rootScope)
       $rootScope.$digest()