How to stop "frequent latecomers" in your meeting sessions?

In my training sessions, whenever I announce for a break (whether tea-breaks or lunch breaks), I would intentionally state the returning time to be an exact timing; eg 1.51pm, or 3.23pm.
Even in arranging meetings with clients or friends, i would do the same. Some people finds it to be too exact and, probably peculiar to some!
But the psychological reason behind it is that the human minds process it as "sounding exact"; therefore it will register it "almost permanent"; which leads to "easy to remember" by people. As a result, almost 100% of the time I would get "on-time" attendance.
So, the next time you are making an appointment with "frequent latecomers", give this approach a go. And do share your experience.

Yours sincerely

Hazriq Idrus
Author, The Stage Fright Antidote!
Founder, The Speaking Factory Pte Ltd