Question: Why does Doc send Marty back to September 2nd? Doc gets shot on the 7th, so this is a very short timetable to work with.
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Answer: The letter that Marty received in 1955 was dated September 1st, 1885; sending Marty back any earlier than that date could potentially cause a time paradox, which was something Doc took great care to avoid throughout the majority of the film trilogy.
zendaddy621
Marty can go back anytime in the 8 months and tell Doc that he will be murdered and to send a letter that was dated September 1st.