I believe time is just a unit of measurement, and it began in its first complex form with the Greeks and the water hydraulics they used to move the gears that followed the planets that they could see at different intervals of time.The moon was used for the months and the sun was used for the days and eventually a calender was devised for accurate time telling.The sun has been used since the dawn of time for telling time and bringing life as science will vouch for.Although opinion differ on exactly how the universe formed the questions left unanswered both on the scientific level and biblical level, leaves only one way for the true answer to be defined by the studies of the person themselves.Time is also defined in many different ways as with the definition of the time people and places that have been around x amount of time.For example would be that the United States is currently on the year 2007 and I am quite sure that China has been around for about 4000 years.