end Date
The date at which the Gantt task ends. The end
date is mandatory.
Example - set the end date of a task
<script>
var task = new kendo.data.GanttTask({
id: 1,
title: "Task1",
start: new Date("2014/6/17 9:00"),
end: new Date("2014/6/17 11:00")
});
</script>