We should swap min & max only when both limits are being
set. Otherwise limit that being set should invalidate other limit
(remove it).

Don't use SelectClipRgn in WM_PRINTCLIENT.

The date should be initialized from local time.

Set day of week when a day is selected in the calender.
Use fixed width fields in datetime.
DTS_TIMEFORMAT is a two bit field, so test accordingly.
Reposition and resize the updown control when the datetime control is
resized.
Respond to updown inputs.