invalid date/time. data exists for this period message on Resmed 9 autoset

[Marl1n]

Hi all, I'm trying to adjust the clock on my Resmed 9 autoset as I'm getting incorrect data on my sleep quality report in the morning.
I manage to change the date and time but when I click the dial to highlight it back to blue I get a message as follows..
Attention : Invalid date /time, data exists for this period
TIA

[justMongo]

You cannot roll the time and date backward to where there is data already in the machine.
Sometimes you have to do it incrementally over several days.

[PaulaO2]

Resmed considers a day to be from noon to noon. Even if there is no data there, it won't let you go back before noon as it is a different day and is considered off limits. I think that's how it goes. Wait until late in the day and try again.

[trish6hundred]

Hi Marl1n,
WELCOME! to the forum.!
Good luck to you with getting the time set on your machine and also with your CPAP therapy.