When does a monthly membership bill for later months?

When does monthly membership bill for successive months? If I sign up today, am I basically just paying for the one day remaining in June? Will my membership then bill me again on the 29th of each month moving forward? Or will it bill me again on the 1st of July for July?

I don't see any information about this but since it's not a pro-rated price for the remained of June, I assume it won't bill me again until the end of July. If that's wrong and it's just going to bill me again right away for July, then I'll just wait and sign up on the 1st instead.