BUT - The episode
"The Squire of Gothos" places TOS in the the 28th century (around 2715); as Trilaine spoke of Napoleon and Spock correctly suryears in Earth's pastmised Trilaine was looking at events 900 years in Earth's past as Gothos was 900 light years from Earth.
So, honestly, prior to ST:TMP, the 'timeframe' for TOS was all over the place.