First off, assume faster-than-light communication exists and has enough bandwidth to do video conferencing. This question wouldn't even be relevant without faster-than-light communication since it takes 3-22 minutes for a message to transmit at the speed of light between Earth and Mars and you can't have a coherent meeting with that kind of latency.
The problem here is that the Martian Sol is 37 minutes longer than it is on Earth. While they could simply go by Earth time*, and probably would keep an Earth clock if they needed to coordinate with Earthlings, many of the people prefer local time since it better matches natural sleep cycles and have adopted local time because the majority of people there don't interact much with Earth. As a result, Martian time essentially behaves like a timezone which shifts in and out of sync with Earth time.
This makes coordinating meetings across planets troublesome, to say the least. A meeting held during reasonable business hours on a weekday one week (assuming both operate on 7-day weeks) might be during breakfast for the Martians next week. After roughly 4 weeks on Earth, Mars is a whole day behind Earth, so Earth is trying to hold a Monday meeting while Mars is enjoying a lazy Sunday.
How do I, the CEO of Megacorp Industries, hold meetings with my Martian executives?
*Obviously, the problem is pretty much irrelevant if people go by Earth time, which would be reasonable to expect if they lived in controlled environments. The "Just use Earth time" also isn't necessarily going to make sense if this concept were to be generalized to some distant planet that is naturally habitable.