A situation I believe you would need to know how to find a starting time in your life is when you are heading to an event.For example, someone may tell you an event (such as a job interview) start 2 hours from now and the now is 4:00pm. All you have to do is 4 plus 2 which equals 6. Then you will be able to know when to go. That is a situation in your life when you need to know how to find a starting time.
I apologize in advance if any false information was given.