Daylight Savings time and the S9

[idamtnboy]

Here is what I have tested and am quite sure is safe advice.

There are two windows when you can change the time on the S9 and not get the 'data exists' error message.

1. The time frame beginning something more than one hour after therapy is stopped, i.e., the air generator is turned off, and noon. That window must be longer than one hour. For example, you wake up and turn off the air generator at 7:12 am. You don't need to power it down. You can set the time back one hour anytime between approx 8:15 and noon. Give yourself a few minutes leeway on the one hour after stopping therapy because I don't know just how soon the S9 is finished recording data.

2. Anytime after 1:00 pm and before you turn the blower on. If you accidentally turn the blower on, turn it off and wait more than one hour. You can probably set the clock back then but I haven't confirmed that. The S9 begins recording data as soon as you turn the blower on, and you cannot set the clock back into any time span for which data exists.

Don't try to set the clock back on the S9 between midnight and 1:00 am because that requires you to set the date back one day. The S9 doesn't like to do that because there is data existing for the previous day. And I suggest you don't set it back between noon and 1:00 pm because noon is the changeover from one S9 day to the next, and data in the summary file is split at that time.

Resscan maybe has a problem in the display of data for the day after the time change and may show a gap, or overlapping data, from 2 am to 3 am, Sunday, in flow and detail data. This is based on some problems some users experienced last spring when changing time. The data exists on the card. If you changed the time on your S9 between the last mask session of the night and noon you may have a problem when saving and closing Resscan after downloading. It appears that everyone who changed the time on the S9 between noon and the first mask session of the night had no problem when downloading, saving, and closing Resscan. This was last spring when we set the clocks ahead. I don't know if Resscan will fouled up for the fall time change.

I suggest the best time to reset the clock and avoid any potential problems is after 1:00 pm any day before Sunday, and any day after Sunday.

[Slinky]

Thanks, IDamTnBoy. You realize, of course, that now that you've posted the best and most cautious way to change the time - I'm gonna screw it up royally!!

I have an S8. I've had an S8 of one model or another since 2006. Every year I've made the time changes w/o a problem - and w/o the slightest idea of what day or the week or time of day I made the changes.

Whachya wanna bet when I change my S8 this month ..... ???

[idamtnboy]

Whachya wanna bet when I change my S8 this month ..... ???

Maybe it's time to have a little excitement for a change!!

[LinkC]

Trying to figure out WHY anyone would NEED to change the clock?

Or is this just a personal challenge? (Try sudoku...it's more portable.)

[ems]

Trying to figure out WHY anyone would NEED to change the clock?

Wondering the same thing. How important is it to change the time??

[Perrybucsdad]

Well, if you are a data junkie like me, the data needs to be accurate. I have been trending my to bed time and total sleep time, so very important to me. If all you are really interested in is the AHI, and just occasionally look at the graphs, then I guess changing the time is no big deal I guess.

[idamtnboy]

Trying to figure out WHY anyone would NEED to change the clock?

Wondering the same thing. How important is it to change the time??

It's really not. Some folks are just anal retentive when it comes to having graphs jibe with real time, that's all.

[thud]

When I got my CPAP from the DME and first looked at my stats in Rescan I noticed the time was over 3 hours incorrect. I like to be accurate too so I set it to the proper time.

[Uncle_Bob]

Seems like a hassle.
I'm glad Arizona doesn't get involved in daylight savings
My data remains accurate year round without me having to lift a finger

[apneawho]

I like the time to be accurate. If I have something unusual happen during the night it helps to have the correct time stamp on the data. When I got my machine from DME, the time was off by 3 hrs. Had to go in a fix it because it drove me crazy to see myself going to be at 1am when I knew it was 10pm!

[LinkC]

Seems like a hassle. My data remains accurate year round without me having to lift a finger

My "data" does as well. I often note that my first apnea was three hours in...or I had a leak in the 6th hour, etc. What the clock said when it happened doesn't really interest me. I have no clue how my machine's clock jives with EST. Or how to change it if I wanted to.

But if it matters to some, rock on...

(At least they aren't claiming the wrong time setting will kill you... )

[Alshain]

Seems like a hassle.
I'm glad Arizona doesn't get involved in daylight savings
My data remains accurate year round without me having to lift a finger

Yeah, there is a push to get Texas to abolish it as well. It just doesn't make sense for southern states. The sun is in the sky at different times here as it is, DST just messes us up even more... and it's worse for people with sleep disorders.

[Pugsy]

My "data" does as well. I often note that my first apnea was three hours in...or I had a leak in the 6th hour, etc. What the clock said when it happened doesn't really interest me. I have no clue how my machine's clock jives with EST. Or how to change it if I wanted to.

M Series Respironics machines themselves use GMT time. The older Encore software programs correlated machine time to computer clock so when computer clock changed the times showing on the reports also changed with it.

New Respironics PR S1 machines also use GMT also. Apparently some firmware versions allowed for setting GMT time offset on some machines as I have seen it in the manuals but none of the PR S1 machines I have seen offered it. Encore Viewer 2.0 runs times off the computer clock I think. Encore Pro 2.xxx software offers GMT offset and also DST active or not. When DST went active my times on the PR S1 machine have been off by one hour ever since the change. Having DST inactive made times off by 2 hours.. Never could figure out why. Only way to make them "correct" would be to alter GMT offset in Pro. They were correct until DST came though. They should go back to being "correct" with the change and deactivating DST in Pro. Not a big deal to me as I am like you...does not really matter to me but threw me for a momentary confusion when trying to see same event in SleepyHead which uses computer clock.

Generally speaking Respironics machines cannot be changed from GMT time. Of course ResMed machines do have a clock to set.

[DoriC]

Now I'm getting scared! On one hand, I agree with Link, it doesn't matter what time an event happens if you can see at what hr it happened, and we know what time we turned the machine on, but on the other hand I like things "right"!! So what to do??

[Slinky]

Hale, humans don't have a clue as to what time it really is. The ANIMALS instinctively know what time it is and how to live and rest peacefully and in sync w/it. They don't try to change it, they just go w/the flow.