DateTimeInputWidget has come quite a way. With OOUI being optimized for 14/16px base size interfaces now, it's time to address some remaining glitches:

• Focus state of inputs is overflowing datetime handle boundaries
  
• Clear icon, see T212022, should not be visible when there's no value to be cleared
• Clear button should be a bit more distant to input values
• Day value is triggering calendar popup and should feature pointer cursor and not focus outline