From publisher blurb:
Arcana and illusion fill the minds of many wizards, but you follow a different path. The wheels of time drive your mind and fuel your body. Whether you glance to the past, alter the present, or twist the future, you know that time is a powerful ally. It cannot be tamed or stopped, but it can certainly be manipulated.
This is a guide to an alternative school option for the Wizard subclass of Dungeons and Dragons (5e).