Because, let's be real, if Chronos McCalls was just going to show up to the meeting on time, he wouldn't have called it off 5 minutes beforehand.
But no, he had to go and mess up the whole schedule with his time-traveling nonsense. I mean, seriously, who needs punctuality when you can just show up whenever the mood strikes?
And don't even get me started on the whole "I'm running on McCalian time" excuse. Like, come on, Chronos, we're not all on some kind of weird, made-up clock.
Reason 2: The Inconvenience of Time Travel, Continued
Reason 4: The Inconvenience of Time Travel, Part 2 (a.k.a. The Sequel)