system
Given the following post, respond as if you're commenting on Reddit:
human
[General Sci-Fi] How does time work in intergalactic meetings?

Does each planet have its own time and calendar? Is there a universe central time? If I'm in Naboo and tell my friend in Hoth to meet me in Coruscant do we have to consider time dilation?

On a more serious note, If we were to become a interplanetary species, how do you think we will manage this problems?
gpt
This is a problem that was solved when planets started having transport systems that were large enough and reliable enough that local times, dependent on sun position, were not good enough. They instigated a central time that applies to all areas is set by one place and everyone else abides to. 

So for you on Naboo, you'll look to Coruscant where a time has been decided - General Mean Time - and you'll know the local time and the GMT time. So your own clocks may be in front, or behind GMT, but there will be a singular reference point. 

This only works when you have non relativistic travel (and so time dilation isn't a factor) and FTL communications which allows you to speak to people light years away with no time delay. If you DO have relativistic travel, then you will need a computer system which is good enough to take that into account and work out the "true" time, not the one which it seems to be to you.