[tz] Epic fail for DST fallback in hospital health records

Russ Allbery eagle at eyrie.org
Sun Nov 4 17:23:21 UTC 2018

On a much more minor note, but a similar problem, Fitbit's sleep tracking
still doesn't work with the daylight saving time change.  It somehow
manages to both think that it lost an hour of data in the middle of the
night (represented by a grey bar hour with no pulse tracking) and think
the night was an hour shorter than it actually was (the final data point,
which was actually measured at 5:54am on the new clock and 6:54am on the
old clock, is recorded as 4:54am).

I'm not quite sure how they managed to get time handling that wrong, but
it amuses me twice a year.

Thankfully, the sleep tracking is basically a toy with no real medical
significance and useful mostly for personal amusement.  But Fitbit
probably has more funding and engineering resources to fix problems like
this than a lot of medical device companies, which is terrifying.

Russ Allbery (eagle at eyrie.org)              <http://www.eyrie.org/~eagle/>

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