The IHTMLPerformanceTiming::loadEventEnd property must return the time when the load event of the current document is completed. It must return zero when the load event is not fired or is not completed.
HRESULT value = object.get_loadEventEnd(ULONGLONG* p);
An ULONGLONG value that represents the time when the HTMLFrameSiteEvents::onload event completed or
0 if the document cannot be loaded.
- Navigation Timing, Section 4.2
The value reported by the IHTMLPerformanceTiming::loadEventEnd property represents the number of milliseconds between the recorded time and midnight January 1, 1970 (UTC).
Windows Internet Explorer 9. This property is supported only for documents displayed in IE9 Standards mode. For more information, see Defining Document Compatibility.