Stress management goes hand in hand with time management
On the one hand, good time management is a critical element of effective stress management. Time management is probably the number one tool for managing stress at its sources. If you get organized, plan ahead, stop procrastinating, clarify your priorities, and delegate effectively you are much less likely to be overwhelmed by the pre-deadline stress. Even without advanced relaxation techniques. And you are more likely to get ahead in balancing your work and family life.
On the other hand, stress management is an essential component of effective time management. Many people cannot completely avoid the sources of their stress, and an overwhelming stress can block their ability to think and perform. In such situations stress management techniques, including relaxation techniques, can be critical for getting unstuck and staying effective.
You also need to be well aware of stress symptoms in order to wisely manage your pace in moving to your goals. If you try to move too fast in short term and don't take adequate breaks, your may damage your abilities and motivation, hurting your longer term progress.
And it is certainly not good time management if you become disabled, miserable, or die prematurely from the effects of excessive stress.