diff --git a/src/Umbraco.Web.UI.Client/src/views/propertyeditors/fileupload/fileupload.controller.js b/src/Umbraco.Web.UI.Client/src/views/propertyeditors/fileupload/fileupload.controller.js
index d62d76c982..05ca39ea16 100644
--- a/src/Umbraco.Web.UI.Client/src/views/propertyeditors/fileupload/fileupload.controller.js
+++ b/src/Umbraco.Web.UI.Client/src/views/propertyeditors/fileupload/fileupload.controller.js
@@ -154,7 +154,7 @@ angular.module("umbraco")
                         if (thumbnail) {
                             if (mediaHelper.detectIfImageByExtension(property.value)) {
                                 //get default big thumbnail from image processor
-                                var thumbnailUrl = property.value + "?rnd=" + moment(entity.updateDate).format("YYYYMMDDHHmmss") + "&width=500";
+                                var thumbnailUrl = property.value + "?rnd=" + moment(entity.updateDate).format("YYYYMMDDHHmm") + "&width=500";
                                 return thumbnailUrl;
                             }
                             else {
diff --git a/src/Umbraco.Web/Editors/ImagesController.cs b/src/Umbraco.Web/Editors/ImagesController.cs
index 14444f53ee..cbbbb30c36 100644
--- a/src/Umbraco.Web/Editors/ImagesController.cs
+++ b/src/Umbraco.Web/Editors/ImagesController.cs
@@ -113,7 +113,7 @@ namespace Umbraco.Web.Editors
 
             var imagePath = imageProp.Value.ToString();
             var response = Request.CreateResponse( HttpStatusCode.Found );
-            response.Headers.Location = new Uri( string.Format( "{0}?rnd={1}&width={2}", imagePath, string.Format( "{0:yyyyMMddHHmmss}", media.UpdateDate ), width ), UriKind.Relative );
+            response.Headers.Location = new Uri( string.Format( "{0}?rnd={1}&width={2}", imagePath, string.Format( "{0:yyyyMMddHHmm}", media.UpdateDate ), width ), UriKind.Relative );
             return response;
         }
     }