LLC/S-corp Late Election

[drtaxes]

Is it true that if my filing date for LLC is the 11th of the month, I can backdate it and have LLC/S-corp election for the 1st of the month (so business income that came in the 1st-10th can be counted towards it?

This is what I was told:

“If the State is able to complete your LLC registration within the same month that you receive income, that money will be able to be roped under the S-corp tax rules. For example, if you get paid on March 10th, and the LLC isn’t completed until March 20th, all the money that you’ve made since March 1st will be able to be roped under the S-corp tax rules.”