I know you are not a/my lawyer
Suppose I write a contract banning you from doing something for an amount of money to be given on a certain date like
In exchange for $1000 paid on October 1, 2018 you agree not to post on Facebook from October 1, 2018 to September 30, 2019.
What happens if I don’t pay you until October 8th? ISTM there is an argument that since I did not meet my end of the contract it is void as of October 2, 2018. Certainly putting a date in a contract should mean something not “When I said the 1st it really is whenever I get around to it.”
And if that is the case, what is the status of the $1000?