This article on Scientific American on how human conventions fall apart at edge cases, such as the meaninglessness of time zones and days/nights at the North Pole:
At the North Pole, 24 time zones collide at a single point, rendering them meaningless. It’s simultaneously all of Earth’s time zones and none of them. There are no boundaries of any kind in this abyss, in part because there is no land and no people. The sun rises and sets just once per year, so “time of day” is irrelevant as well.
They could see the smiling faces of their colleagues just feet away—but they were two time zones apart.
The ship operates like a windup toy, disconnected from the spinning of the planet, which normally dictates time. “Time” is just an operational ritual, intended to create the illusion of regularity.
As people push boundaries scientifically, physically, virtually, more conventions will fray, and more will need to be layered on top: at a point in history people created the concept of dividing their day into 24 hours. Atop that, time zones became necessary with the advent of railroads.
With space travel, we’ve reached the next level – the International Space Station typically orbits the earth 16 times a day, leading to sunrises and sunsets approximately every 45 minutes, so the layered convention is to anchor clocks to GMT. If and when people begin colonies on Mars or other planets, we’ll need even more layers to translate between two planetary day/time systems.