Time management has been defined as "the process of organizing and planning how much time you spend on specific activities."
Writers, speakers and those promoting better time management often focus the majority of their time and energy on tools and processes that can be used and how to use them to achieve desired outputs like effectiveness and productivity and how to possibly measure them. Yet there is a vital aspect I rarely see addressed.
One of the key components that must part of the equation (one I would argue is more important than any other) to achieve the desired outcomes is that you must possess the discipline and the commitment to your tool and process of choice. You need to be able to make the personal commitment to yourself, to physically block time on your calendar to do the things you know you need to do. When that time comes, absolutely nothing else will happen at that time.
Whatever it is you are pursuing, time management is without a doubt an important aspect to making progress towards your goal. However if you do not muster the discipline to stick to what you are doing, you will never get there. For example... let's say you want to get into better physical shape. You can easily download some new and cool apps (i.e. the tool) of which many claim to have the greatest and/or easiest program (i.e. the process) you should follow, yet if you only workout once in a while or worse yet, only when you feel like it, you'll just never get there. You must commit to working out multiple times a week if not daily.
You need to be able to make the personal commitment to yourself, to physically block time on your calendar to do the things you know you need to do.
Even if you just do 20 sit ups and 20 push ups, but you do them each and every day. You may not see a difference after once or twice, but changing your habits, committing to yourself to do them each and every day... you will no doubt see a difference over time. More importantly, what you will be doing is building a good habit of that you will WANT to do more and more as your body will begin to feel better and stronger. The longer you stick to it, the easier and more desirable it will be to continue doing it.
See video #22 on my 31 Days to Change Your Life for more on time from Jordan Peterson.