Try to imagine a life without time keeping. You probably can't. 
You know the year, the month and the day of the week. There's a clock on your phone, your wall and in your computer. 
You have a schedule, a calendar and a time for dinner. Yet all around you time keeping is ignored. The birds outside are never late. A dog does not care for time nor does a cat check his watch. 
Man alone measures time. And because of this, man suffers a fear no other creature endures. 
A fear of time running out.