If you compare the source code from qabstractspinbox.cpp and qdatetimeedit.cpp:

inside void keyPressEvent(QKeyEvent *event)

qabstractspinbox will emit a returnPressed signal for the contained QLineEdit:

{{ emit d->edit->returnPressed();}}

but qdatetimeedit.cpp won't. This creates an unnecessary discrepancy in behaviour, causing problems for me, since I would like to catch the Return/Enter keypress without using an event filter. Please fix.