...At which point I evoke the theory that stardates in TOS have more than four digits before the separator. After all, stardates are used for referring to events of relatively distant past, such as Kirk's birth or something that Kodos the Executioner did. That's impossible if the entire cycle is only about a decade long, and incredibly confusing if there are multiple stardates 1234.5, once every decade.
However, if we assume a fifth digit to denote decades, and a sixth to denote centuries, the dates make theoretical sense. We can then try and apply this in practice, so that "Magicks" is from the next stardate decade with respect to, say, "Turnabout Intruder"; the TAS episodes would then fit in, and TMP would be restored to where the writers probably originally intended it to be, 2279 or so vs. the late 2260s of TOS (so that the dates in fact are airdates plus three centuries).
That means mixing some of the "sensible" TAS stardates with the TOS ones within the same stardate decade, though, with the attending problems of whether the bridge has one or two doors...
Generally, I'd argue the six-digit stardate theory has merit in sorting out the live-action shows and movies, but trying to apply it to TAS is wasted effort, and not all TOS movies conform, either.
"The Conscience of the King" and "The Galileo Seven"
This is an example of a potential overlap, not realized one. In the first episode, the ship was projected to reach a specific destination at a specific stardate; in the latter, we learn that there was an emergency mission that apparently got priority, so that the ship at that originally given stardate wasn't at the originally intended destination after all. The stardates referring to events that actually took place don't overlap.
"The Gamesters of Triskellion" and "Metamorphosis"
This is a good example of plausibly arguing that one of the characters misspoke. Spock's final "Stardate 3259.2; the Captain has been missing for two hours" is completely out of line with the fact that the Captain went missing moments after declaring that the stardate was 3211.8. If we ignore Spock here, there's no overlap.
Timo Saloniemi