The opening hours screen states which time zone the listing uses, so the times you set are the times your customers see.
If you have listings in different places, check each one separately rather than assuming they match.
Where it is shown
On the opening hours screen, which states the listing’s time zone beside the weekly hours.
If you have listings in different places
Check each one separately. Setting 9 to 5 on two listings in different time zones does not mean the same thing, and a booking taken at the wrong hour is a customer standing outside a locked door.