fix(datepicker): handle correctly min/max when cleared

src/datepicker/datepicker.js

@@ -47,13 +47,13 @@ angular.module('ui.bootstrap.datepicker', [])
 
       if (attrs.min) {
         scope.$parent.$watch($parse(attrs.min), function(value) {
-          minDate = new Date(value);
+          minDate = value ? new Date(value) : null;
           refill();
         });
       }
       if (attrs.max) {
         scope.$parent.$watch($parse(attrs.max), function(value) {
-          maxDate = new Date(value);
+          maxDate = value ? new Date(value) : null;
           refill();
         });
       }
@@ -161,7 +161,7 @@ angular.module('ui.bootstrap.datepicker', [])
 
       scope.$watch('model', function ( dt, olddt ) {
         if ( angular.isDate(dt) ) {
-          selected = angular.copy(dt);
+          selected = new Date(dt);
         }
 
         if ( ! angular.equals(dt, olddt) ) {

src/datepicker/test/datepicker.spec.js

@@ -507,6 +507,20 @@ describe('datepicker directive', function () {
         }
       }
     });
+
+    it('enables everything before if it is cleared', function() {
+      $rootScope.mindate = null;
+      $rootScope.date = new Date("December 20, 1949");
+      $rootScope.$digest();
+
+      clickTitleButton();
+      for (var i = 0; i < 4; i ++) {
+        for (var j = 0; j < 3; j ++) {
+          expect(getOptionsEl(i, j).find('button').prop('disabled')).toBe( false );
+        }
+      }
+    });
+
   });
 
   describe('max attribute', function () {
@@ -580,6 +594,16 @@ describe('datepicker directive', function () {
         }
       }
     });
+
+    it('enables everything after if it is cleared', function() {
+      $rootScope.maxdate = null;
+      $rootScope.$digest();
+      for (var i = 0; i < 5; i ++) {
+        for (var j = 0; j < 7; j ++) {
+          expect(getOptionsEl(i, j).find('button').prop('disabled')).toBe( false );
+        }
+      }
+    });
   });
 
   describe('date-disabled expression', function () {