allowReverse Boolean (default: false)

Enables the user to select an end date that is before the start date. This option is available only when the selectable configuration is set to range.

Example - enable reverse selection

<div id="calendar"></div>
<script>
    $("#calendar").kendoCalendar({
        selectable: "range",
        allowReverse: true,
        showOtherMonthDays: false
    });
</script>