There is no reason to be unclear with folks with some weird dialectal thing that is inconsistent across cultures when you aren’t in that culture… or to keep doing something on purpose when asked to stop for a couple of months. I thought it would be a one-time thing since I wasn’t feeling it that night, but everything ended up fizzling out after I guess my no show. We would chat if we ran into each other but neither of us planned anything together after.
When you do not include a preposition like til or past or before or after there is no way to underestand relative to which side of the hour. This is why it is interpreted differently in some cultures. This is also why no one I grew up with ever said anything other than 5:30, 6:30 PM, or 17:3:0 since—aside from the 12-hour Anglophone clock thing—you can remove both ambiguity & doing mental math (also typing less characters).
Funny when I first read about it: https://en.m.wikivoyage.org/wiki/English_language_varieties#Date_and_time
Which had explicit instructions