Similar here. For me, if I'm given some arbitrary deadline in the future, it almost guarantees I'm not going to do the thing until the day before, or depending on the task, hours before it's due.
"Hey webguy, we need this report by the end of next week" means I'm not doing it until Friday afternoon, and I have no control over it. Doesn't matter if I try to work on it earlier, just won't happen.
It's having an interest based nervous system. We crave novelty, urgency, interest, and challenge to do anything.
My essence knows, without a shadow of a doubt, that time is cyclical. And just because some person or org says, randomly today, that something NEEDS TO BE COMPLETED by next Thursday or the world ends, doesn't actually change the nature of time.
There have been countless things in life where, as a civilization, we simply allow for trivial shit like this to have actual, life altering consequences. I think we're dumb.
I forget where (and I really ought find it again) but I recall some linking of ADHD as simply the kind of traits that are necessary for survival -esque scenarios.
I know that I don't feel as awkward and weird when I'm in nature or building huts or what have you. Seeing the abundance of what nature has to offer and the possibilities actually feels far better than being in a concrete building and being forced to walk ONLY in designated walking areas.
My ADHD always feels the worse when I realize that I have to abide by _insert_arbitrary_deadline_here.