How do they determine star dates on, "Star Trek"?

Answer 1

Gene Roddenberry created stardates as an abstract idea without any thought to actual implementation, choosing to leave the idea up to the imaginations of the viewers.

In Star Trek: The Next Generation, They were 5-digit numbers, initially starting with 4 (symbolically to represent the 24th century), and followed by the season number.

Within a single episode, TNG writers have most commonly increased stardates at the rate of one unit per Earth day, contradicting the 1000 units per year used on the larger scale. Although closer to a usable system than they were in the original series, stardates remain inconsistent and often arbitrary.
For example, Ronald D. Moore flatly said that stardates do not make sense and shouldn't be examined closely.

Answer 2

As others have said they're made up.

A large part of the existence of Stardates is that when the original series of Star Trek was created a lot of things were left rather undefined including the time it was set in (though they did later end up choosing mid 23rd century for the original series).

People have come up with formulae to compute a stardate but those are of the entertainment value only variety (though so is the rest of Star Trek).

Answer 3

The concept is made up. I don't really think it ever says how star dates are determined. It is just the calender they use on the ship as they are not on Earth orbiting the Sun and need some consistent system to measure time.

Answer 4

I have to go with A. I rarely star question unless I find them interesting.