Your time is managed when you have control over the activities and events in your life. And the first step towards successful time management is to control the mix of events in your life.
What this means is that you must evaluate each activity that comes your way and decide whether or not you allow it to occupy your time. In order to be objective and consistent in filtering activities, you must have a basis for your decision. If you have a set of clearly stated goals for each facet of your life, you have the ability to test every activity that comes your way and see whether it leads you towards or away from the appropriate goal. Reject the activities that will not help you accomplish your goals.
Time management is a life skill. It is an essential part of personal development and self-discipline so learn how to master it.