visual alarm in kde4

in the console:

at 15:59 << !
DISPLAY=":0" kdialog --passivepopup "Turn off soup" --title "cook dinner" 30
!
at 15:59 << !
DISPLAY=":0" kdialog --passivepopup "Turn off soup" --title "cook dinner" 30
aplay ~/music/alarm.wav
!