You can see the time remaining until each alarm is due by displaying the 'Time To' column in the alarm list. (Right click on the column headers to allow this to be selected.)

Hovering the mouse over KAlarm's system tray icon will show how long until each alarm for the current day.

If these features don't provide what you want, please explain in more detail what exactly you are looking for.

(In reply to David Jarvie from comment #1)
> You can see the time remaining until each alarm is due by displaying the
> 'Time To' column in the alarm list. (Right click on the column headers to
> allow this to be selected.)
That doesn't display the seconds,but if it could,then that's what I want

KAlarm is designed to handle times in units of minutes, not seconds. It is not designed to be accurate to within a second. So to avoid misleading users as to its accuracy, I would not want to show any times which include seconds.

Since it appears from what you say that it does what you want except for displaying seconds, I'm marking this request as closed.