I always feel compelled to post this when there's a question about when TMP took place.
I've mentioned this before in another thread that if one were to take Gene Roddenberry's novelization of 'The Motion Picture' at face value in the early chapters he lays out a timeline of Captain Kirk and the Enterprise prior to the events of the 'Motion Picture'.
Based on that information, the timeline could be laid out thusly
9 years ago - Kirk takes command of the Enterprise (Chapter 5)
8 years ago - Start of the FYM (Chapter 11)
7 years ago - Christine Chapel joins the Enterprise (Chapter 11)
3 years ago - End of the FYM. Kirk is promoted to Admiral. McCoy retires. Scotty begins redesigning and refitting the Enterprise (Chapters 7, 9)
2.8 years ago - Spock begins studying Kolinahr on Vulcan (Chapter 2)
2 1/2 years ago - Kirk is placed in charge of Starfleet Operations (Chapter 5)
2 years ago - Chapel earns her doctorate and becomes an M.D. (Chapter 11)
18 months ago - Kirk recommends Captain Decker oversee the Enterprise refit and command her once it is completed (Chapter 3)
TMP
If you use the 2270 date from the Voyager episode 'Q2' as the end of the FYM it works out thusly.
2264 - 9 years ago - Kirk takes command of the Enterprise (Chapter 5)
2265 - 8 years ago - Start of the FYM (Chapter 11)
2266 - 7 years ago - Christine Chapel joins the Enterprise (Chapter 11)
2270 - 3 years ago - End of the FYM. Kirk is promoted to Admiral. McCoy retires. Scotty begins redesigning and refitting the Enterprise (Chapters 7, 9)
2270 - 2.8 years ago - Spock begins studying Kolinahr on Vulcan (Chapter 2)
2271 - 2 1/2 years ago - Kirk is placed in charge of Starfleet Operations (Chapter 5)
2271 - 2 years ago - Chapel earns her doctorate and becomes an M.D. (Chapter 11)
2272 - 18 months ago - Kirk recommends Captain Decker oversee the Enterprise refit and command her once it is completed (Chapter 3)
2273 - TMP