You should que a nightly one of these for each time zone :)
There are 40 timezones. I have three daily reminder posts (make your bed, unfuck tomorrow morning, and 11 p.m.). If I were to queue a post for each reminder in each timezone, that would be 120 posts a day without any additional content besides the reminders. I’m pretty sure no one would stick around after about a day or so of that.
Instead, people can use the tools at their disposal to have the reminders appear at the right time for them. Reblog and use the “publish on” feature so that it appears at the right time for you, as suggested here, and here, and here, and here, and here, and here.