When did time begin?

For each one of us time started when we begin to perceived it, not when we were born. We were taught by our parents when is time to eat, when is time to sleep and later on when is time to wake up. We were taught that Saturday and Sunday are free days and in the period of winter and/or summer there is a period free from any responsibility, is what we call vacation. We were taught that once per year we celebrate our birthday. In the moment we start to…