notify

Notify when a certain time has elapsed

When we want to measure how much time something took, we use a stopwatch. We click once at the beginning of the time we want to measure, click once at the end, and get a reading of the elapsed time. When we want a notification that a particular amount of time has elapsed we use a timer. We set the amount of time in the future that we want to be notified, start the timer, and the timer notifies us when that amount of time has passed.