system
Given the following post, respond as if you're commenting on Reddit:
human
[General Sci-fi]Do planets keep two calanders?

So you set up a colony outside your sol system, its got vastly different solar calender and seasonal lengths. Maybe it switches between multiple summer and springs between each fall and winter due to a stable axis wobble.

Does it make sense to keep two calanders? A legal one so there is no debates or confusions like "they are 18" because the colony they are from takes half the time to complete a solar revolution. And a calander that follows the new planets seasons?
gpt
Definitely. You would have a standardised calendar based on your home/captial/other standard world and a calendar for your own world.

The Standard would be used for bureaucracy and interplanetary dealings, and the local calendar for farmers and local day-to-day things.

Star Wars had Galactic Standard Time based off the time at the Imperial Palace back in Coruscant, and official documentation would be dated under the Coruscant calendar.