diff --git a/platform/forms/res/templates/controls/datetime.html b/platform/forms/res/templates/controls/datetime.html
index 6dae89eb8a..8c61fb9861 100644
--- a/platform/forms/res/templates/controls/datetime.html
+++ b/platform/forms/res/templates/controls/datetime.html
@@ -35,8 +35,8 @@
             <span class='field control date'>
                 <input type='text'
                        name='date'
-                       placeholder="YYYY-DDD"
-                       ng-pattern="/\d\d\d\d-\d\d\d/"
+                       placeholder="{{format}}"
+                       ng-pattern="/\d\d\d\d-\d\d-\d\d/"
                        ng-model='datetime.date'
                        ng-required='ngRequired || partiallyComplete'/>
             </span>
@@ -80,4 +80,4 @@
     </ng-form>
 
 
-</div>
\ No newline at end of file
+</div>
diff --git a/platform/forms/src/controllers/DateTimeController.js b/platform/forms/src/controllers/DateTimeController.js
index c026e98935..e37e3a8f71 100644
--- a/platform/forms/src/controllers/DateTimeController.js
+++ b/platform/forms/src/controllers/DateTimeController.js
@@ -26,7 +26,7 @@ define(
     function () {
         "use strict";
 
-        var DATE_FORMAT = "YYYY-DDD";
+        var DATE_FORMAT = "YYYY-MM-DD";
 
         /**
          * Controller for the `datetime` form control.
@@ -92,6 +92,9 @@ define(
             $scope.$watch("datetime.min", update);
             $scope.$watch("datetime.sec", update);
 
+            // Expose format string for placeholder
+            $scope.format = DATE_FORMAT;
+
             // Initialize forms values
             updateDateTime(
                 ($scope.ngModel && $scope.field) ?
@@ -102,4 +105,4 @@ define(
         return DateTimeController;
 
     }
-);
\ No newline at end of file
+);