The day the rent is due is the start of a lease month. Rent is usually due on the first day of a month but it can be another day. Notice must be given before the end of a rent month to take effect at the end of the next rent month.

EXAMPLE

Tenant must pay rent on June 1.
Tenant wants to end the lease.
Tenant must give a written notice that is received by the landlord on or before May 31 to end the lease on June 30.
If the notice is received by the landlord the month to month lease will end June 30.
Landlords must give the same one month notice when they want to end a month to month lease.