How do people greet each other when in different time zones?

How do people greet each other when they are in different time zones?

For example, suppose there is a phone call between two people: one is in Central European Time 1600 (say Germany, in the afternoon), and the other is in Eastern Standard Time (in the US, at 10am, the morning).

Do people greet each other with 'Good Monday/Tuesday/...? This doesn't completely solve the problem, but it's better than 'Good Morning/Afternoon/Evening'.

We usually say 'Good evening to India, good afternoon to Germany, good morning to America' or equivalent, or 'good morning, good afternoon, good evening, whichever time it is where you are', but it is still everytime as a half- or quarter-joke; there is simply no standard way to handle it, as it is too new a need to have made it into standard language.
Of course, you can avoid the issue by saying 'hello, how you are all doing' or some other expression that doesn't refer to the time of day.

It is very rare that different locations have different weekdays, and I haven't ever heard any reference to the weekday in the greeting anyway. So 'Good Monday', etc. is a no-no.