Alan Dean Foster, in his Star Trek Log series, completely discarded the haphazard TAS stardates and assigned new ones. Here is the list of TAS episodes in the first column, and in the second column the stardates ADF gave them (derived from a wiki, so, corrections welcome):
In the third column I calculated out an earth date assuming 1 stardate = 1 earth day (per the TOS Writer’s Guide), and calibrated it for “The Survivor” taking place on Christmas 2269. It starts out okay, with weeks or months between each adventure, but then all of a sudden they are happening every day, sometimes multiple episodes in a single day!
The adventures span an 8-month period, which seems short but at least the right ballpark. It’s not meant to be 8 years, for example. So even if 1 stardate = 1 day was not intended, what is? I thought maybe ADF changed his calculation midstream, intentionally or unintentionally, and starting with LOG FOUR (“The Terratin Incident,” etc.) was thinking in terms of 0.1 stardate = 1 day.
But maybe one of you has some better insight, especially those who are really familiar with these books. I think it’s worth half-assuming ADF didn’t just completely fudge this, since he bothered to replace the TAS stardates in the first place.

In the third column I calculated out an earth date assuming 1 stardate = 1 earth day (per the TOS Writer’s Guide), and calibrated it for “The Survivor” taking place on Christmas 2269. It starts out okay, with weeks or months between each adventure, but then all of a sudden they are happening every day, sometimes multiple episodes in a single day!
The adventures span an 8-month period, which seems short but at least the right ballpark. It’s not meant to be 8 years, for example. So even if 1 stardate = 1 day was not intended, what is? I thought maybe ADF changed his calculation midstream, intentionally or unintentionally, and starting with LOG FOUR (“The Terratin Incident,” etc.) was thinking in terms of 0.1 stardate = 1 day.

But maybe one of you has some better insight, especially those who are really familiar with these books. I think it’s worth half-assuming ADF didn’t just completely fudge this, since he bothered to replace the TAS stardates in the first place.