Creation and playback disagreed about which clock a schedule's hours are on.
The player evaluated blocks in the device's zone — an operator override, else
whatever the player's OS reported. Creation defaulted to a bare 'UTC', because
the dialog never asked for a zone and the server filled the silence with one.
So hours typed as "09:00 to 17:00" were stored as UTC and evaluated somewhere
else. For anyone outside UTC the schedule was correct and appeared to do
nothing, opening hours later than intended, with nothing on screen to explain
why. A user in Asia/Tokyo hit exactly this and reported it as "I added
something and it didn't appear".
Both sides now resolve through lib/device-timezone, so they cannot drift: an
explicit device override wins, then the OS-reported zone, then null. A legacy
'UTC' override counts as unset, since that was the old default rather than a
deliberate choice and a genuine UTC deployment is indistinguishable from an
unconfigured one.
A new schedule inherits its target's zone — the device's, or for a group its
leader's, falling back to the oldest member that reports one. A zone named
explicitly by the caller still wins; this only fills the silence. A target that
has never reported one still lands on UTC, which is the previous behaviour made
explicit rather than assumed.
The dialog now states which clock the hours are on, and says so differently when
that clock is not the operator's own. Stating it is the other half of the fix:
the server can pick the right zone, but the user still has to be able to see it.
Tests pin both directions and, most importantly, that creation and playback
resolve identically from the same device row.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
