More than 30 years ago, I discovered in my research that people with ADHD have significant deficits in their sense of time and especially in using time to guide their behavior more effectively. We call the latter time management. And ADHD is among the worst disorders one can have when it comes to deficits in time management. Consequently, I came up with the concept that ADHD was a form of time blindness. That the passage of time did not influence their behavior the way it does for typical people. They also had a nearsightedness or myopia to the future, dealing only with events that were near in time and not those further away in time as other typical people are able to do. This problem with time and time management was found in children, teens, and adults with ADHD and so is a chronic difficulty for them. This video reviews this concept of ADHD as time blindness and discusses ways that one may be able to treat it or compensate for it. For more on this idea and what to do about it, see my books below:

Taking Charge of ADHD: The Complete Authoritative Guide for Parents (4th ed.) published in June 2020)
12 Principles for Raising a Child with ADHD (published in October 2020)
Taking Charge of Adult ADHD (4th ed.) (Published October 2021)
Treating ADHD in Children and Adolescents: What Every Clinician Needs to Know. (Published May 2022)