There is only one alarm time that will alarm at a random time between the start time and the end time. And it will deceive you that it is end time now.
For example, you have to get up at 9 o'clock, but you want to get up early. But you can't because of your laziness. Then, you can set the start time to 6 o'clock and the end time to 9 o'clock. It will alarm at a random time, such as 7 o'clock. And you won't know the real time and consider the worst case. Finally, you will get up 2 hours before the deadline.
