After transferring ownership, when does 30 day period to evict start?

[Kelsey Vander Meulen]

I just acquired a triplex in Arizona. One of the tenant’s lease expires on 10/24/24 in less than a week. I am closing tomorrow 10/18. I plan to hand deliver the 30-day notice to vacate tomorrow 10/18. Does the tenant have 30 days to vacate the premise starting on 10/18? In other words, would he need to vacate by 11/18? Or does the tenant have 30 days to vacate the premise starting on the day rent is historically due? So if tenant was paying rent on the first of the month, will he now have until 11/30 to vacate the premise even if I deliver the notice tomorrow 10/18?

Thanks for the advice.

Kelsey