diff --git a/index.bs b/index.bs
index 6fce99f..f52182f 100644
--- a/index.bs
+++ b/index.bs
@@ -762,7 +762,7 @@ following type-specific properties:
 <table class=props>
   <tr><th>Type</th><th>Properties</th></tr>
   <tr><td>{{Blob}}</td><td>{{Blob/size}}, {{Blob/type}}</td></tr>
-  <tr><td>{{File}}</td><td>{{File/name}}, {{File/lastModified}}, `lastModifiedDate`</td></tr>
+  <tr><td>{{File}}</td><td>{{File/name}}, {{File/lastModified}}</td></tr>
   <tr><td>[=Array=]</td><td>`length`</td></tr>
   <tr><td>[=String=]</td><td>`length`</td></tr>
 </table>
@@ -6344,10 +6344,6 @@ ECMAScript value or failure, or the steps may throw an exception.
       : If |value| is a {{File}} and |identifier| is "`lastModified`"
       :: Let |value| be a Number equal to |value|'s {{File/lastModified}}.
 
-      : If |value| is a {{File}} and |identifier| is "`lastModifiedDate`"
-      :: Let |value| be a new [=Date=] object with \[[DateValue]] internal slot
-          equal to |value|'s {{File/lastModified}}.
-
       : Otherwise
       ::
           1. If [=/Type=](|value|) is not Object, return failure.
@@ -6897,6 +6893,7 @@ For the revision history of the second edition, see [that document's Revision Hi
 * Added {{IDBFactory/databases()}} method. ([Issue #31](https://github.com/w3c/IndexedDB/issues/31))
 * Added {{IDBTransaction/commit()}} method. ([Issue #234](https://github.com/w3c/IndexedDB/issues/234))
 * Added {{IDBCursor/request}} attribute. ([Issue #255](https://github.com/w3c/IndexedDB/issues/255))
+* Removed handling for nonstandard `lastModifiedDate` property of {{File}} objects. ([Issue #215](https://github.com/w3c/IndexedDB/issues/215))
 
 <!-- ============================================================ -->
 # Acknowledgements # {#acknowledgements}