Avoiding capital gains tax when selling home

[Brandy Smith]

Hi friends! Florida newbie here again. If I want to sign that “1031 Form” to avoid capital gains tax..how far in advance to the closing do I have to file that? I’m putting on the market in beginning of November when my tenants lease ends. Also, if for some reason I miss the deadline to reinvest? What happens? ..What are some things you’ve done to make sure you close within the deadline? I hope I’m understanding this right, I’m a first timer! :)