No "Edit As" DateTime Option

There is a "View As" DateTime setting for an attribute, but only "Edit As" Date and "Edit As" Time. If a user commits an update to a row while a field is set to "Edit As" Date the time portion of the attribute (for datetime or timestamp in MySQL) is always reset to "12:00:00 AM" Is there a way to set both the Date and Time from the UI? From what I can see it is only possible to set the Date or the Time, not both.
Justin