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Confirmed. Good catch!
I had a little look, it is because of this line of code http://code.vtiger.com/vtiger/vtigercrm/blob/master/modules/Calendar/models/Field.php#L49
where the calendar module overrides the normal field datatype processing and calls that a datetime rather than a date. If you change that to just date then it works as you would normally expect - however that removes the end time component of the end date on tasks. It really needs to test if it is an event or task and return datetime for events and date for tasks.
mentioned in merge request !65 (merged)
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