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Adding Daylight Savings support to OSCAR
#1
Adding Daylight Savings support to OSCAR
I've been using OSCAR for a while to view the data from my Resmed Airsense 10 Autoset, which does not automatically adjust it's internal clock for daylight savings. The date and time settings are on the clinician's menu, so the user presumably isn't meant to adjust the machine's clock either.

This didn't really bother me until I recently got a Contec CMS50H pulse oximeter and started importing data from it into OSCAR to see if my SpO2 or heart rate varies when the CPAP machine reports an apnea or hypopnea. Obviously for this to work they need to be time synchronised, but if I enter the time in daylight savings time into the CMS50H at the start of the session, they're out by an hour because the CPAP machine is in standard time.

Would it be possible to add support for daylight saving adjustment to OSCAR so that it presents times in daylight savings time when displaying sessions that were captured when DST was active?

Cheers,
Graham
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#2
RE: Adding Daylight Savings support to OSCAR
From my limited knowledge of OSCAR, it only records the time without an identifier for DST. Even if it did, many users travel with their CPAP and are setting the time to a different time zone on a regular basis.

When importing your SpO2 data, there should be an option to either use the oximeter's time or use the CPAP's staring time. Try selecting the latter.
Crimson Nape
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#3
RE: Adding Daylight Savings support to OSCAR
(01-16-2021, 03:59 PM)Crimson Nape Wrote: From my limited knowledge of OSCAR, it only records the time without an identifier for DST.  Even if it did, many users travel with their CPAP and are setting the time to a different time zone on a regular basis.  

When importing your SpO2 data, there should be an option to either use the oximeter's time or use the CPAP's staring time.   Try selecting the latter.

This would involve adjusting times during import, or recording whether DST was in effect and adjusting them when displayed later.
I suspect most users aren't travelling most of the time; it makes sense to optimise and automate the most common case.
Unfortunately the CPAP time is the one that's incorrect, unless the user knows how to access the clinician's menu and bothers to change it; which the manufacturer appears to discourage.
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#4
RE: Adding Daylight Savings support to OSCAR
Eventually we'll probably record everything as UTC and convert local timestamps to that upon import.

But for now it's a bit of an inconsistent mess, largely thanks to the different manufacturers doing different things.

(And it will eventually be easier to fix timestamps after import.)
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