security deposit refund question please clarify

[Linda Thomas]

Good evening all:

I am in PA and my tenant was evicted on June 1, 2021 and in the state of PA I have 30 days to return security dep or mail letter with deductions list. Would the letter need to be mailed by June 30 or July 1st? Does the 1st of June count as day 1 or does June 2nd count as day 1. Just looking for clarification and the exact date please that I need to mail the letter so I don't end up with a bigger problem. thanks!