Hello,
it may depend on how do you parse the Event values on the server-side.
If you use model binding, i.e. specifying action like following:
public ActionResult Save(Event changedEvent)
The all values will be parsed using server culture settings. It means that if xml_date format does not match the format that is used in your current locale (if you run it locally) or on remote server - dates will be parsed incorrectly.