diff --git a/APPL/Shared/header.inc b/APPL/Shared/header.inc
index 670a4eed3d..4c3f8d4973 100644
--- a/APPL/Shared/header.inc
+++ b/APPL/Shared/header.inc
@@ -443,7 +443,7 @@ FCLTHeader =
        var tinc = new Date(hinc.DateLastModified);
        if (tcsx > tcss || tinc > tcss)
        {
-           __Log("{0} is older ({1}) than default.csx ({2}), refreshing it.".format(this._templateCss, toDateTimeString(tcss, true), toDateTimeString(tcsx, true)));
+           __Log("{0} is older ({1}) than default.csx ({2}), refreshing it.".format(this._templateCss, toISODateTimeString(tcss, true), toISODateTimeString(tcsx, true)));
            this.generateTemplateCss();
        }
     }
diff --git a/APPL/Shared/logger.inc b/APPL/Shared/logger.inc
index 71a87676db..236717f8bd 100644
--- a/APPL/Shared/logger.inc
+++ b/APPL/Shared/logger.inc
@@ -426,6 +426,12 @@ function toISODateString(jsDate)
 
 function toISODateTimeString(jsDate)
 {
+    if (typeof jsDate == "object" && jsDate.type == 135/*adDBTimeStamp, oRs("datum")*/)
+        jsDate = new Date(jsDate.value);
+
+    if (typeof jsDate == "date") // een oRs("datum").value
+        jsDate = new Date(jsDate);
+
     return toISODateString(jsDate) + " "
          + padout(jsDate.getHours()) + ":" + padout(jsDate.getMinutes())   + ":" + padout(jsDate.getSeconds());
 }