diff --git a/src/main/webapp/scripts/ezCalendar.js b/src/main/webapp/scripts/ezCalendar.js
index a1e0828c1b31f9d44af3ecf713cf9f9f302d5d83..b27b9acc59718dc18ba23f4b8d51f475064c73e3 100644
--- a/src/main/webapp/scripts/ezCalendar.js
+++ b/src/main/webapp/scripts/ezCalendar.js
@@ -641,7 +641,7 @@ $(function(){
         var $input = $(input);
         var format = XNAT.app.utils.getValueByClass($input,['iso','us','eu','euro']);
         var val = $input.val();
-        if (val === ('__/__/____' || '____-__-__' || '')){
+        if (val === '__/__/____' || val === '____-__-__' || val === ''){
             $input.val('');
             return false;
         }