So I made an outdated guide but apparently all the trainers are coming an hour earlier now...
K here you go

(Central Standard Time (CST) btw)

Firenzian (Gun Trainer): 12:00 AM, 3:00 AM, 6:00 AM, 9:00 AM, 12:00 PM, 3:00 PM, 6:00 PM, 9:00 PM

Lost Hoplite (Melee Trainer): 1:00 AM, 4:00 AM, 7:00 AM, 10:00 AM, 1:00 PM, 4:00 PM, 7:00 PM, 10:00 PM

Kurotadori (Magic Trainer): 2:00 AM, 5:00 AM, 8:00 AM, 11:00 AM, 2:00 PM, 5:00 PM, 8:00 PM, 11:00 PM

Um, I hope this helps next time your pirate becomes level 20 or resets their practice points. I just recently decided to get those magic epics because I'm no longer worried about them revealing hides. I was going to go train them today at 7:00 PM (PST) because my outdated guide told me to. Sadly, I actually didn't have to wait an hour and lose the opportunity. So, like, if you use this new one, you won't be mislead. That is, if they don't change the times again. Ok bye.