ON *:JOIN:*:{
switch ($time(HH:nn)) {
case (19:50) {
echo -a 4 $time(HH:nn) is 19:50
break
}
case (19:51) {
echo -a 7 $time(HH:nn) is 19:51
break
}
default {
echo -a $time(HH:nn)
}
}
}

output:
SWITCH Unknown command
-
CASE Unknown command
-
CASE Unknown command
-
DEFAULT Unknown command
confused