Help determining date rental is considered placed in service

I am trying to determine the date to use for when our rental was first placed in service. I first advertised the house for rent on April 04.15.22 by taking a flyer about our rental to the city managers office in the small town we live in. There is an extreme shortage of houses to rent here. and I read in the newspaper that several candidate for a new police chief position had dropped out because of this. We were in the process of completing a new home to rent out. Nothing happened because of the flyer. Due to health issues from a car accident we did not have the final inspections completed until July 13th. The date of "Residential Certificate of Occupancy" is dated effective 08.21.22.  We have a signed rental contract dated 07.15.22. I would appreciate any help in determining the right date to use for when the house was first placed in service.