diff --git a/lib/api3/generic/patch/operation.js b/lib/api3/generic/patch/operation.js
index 1e5cd0f129b..dff18c70dbe 100644
--- a/lib/api3/generic/patch/operation.js
+++ b/lib/api3/generic/patch/operation.js
@@ -22,8 +22,10 @@ async function patch (opCtx) {
   }
 
   await security.demandPermission(opCtx, `api:${col.colName}:update`);
-
-  col.parseDate(doc);
+  
+  // parseDate is not valid for patch operation
+  // (it is adding new fields)
+  // col.parseDate(doc);
   const identifier = req.params.identifier
     , identifyingFilter = col.storage.identifyingFilter(identifier);