The Time Machine's day / hour / quarter-hour activity feeds now group on datetime(observed_at, 'localtime') in SQLite — rotating each stored-UTC timestamp into the machine's zone per-instant (DST-correct) before the key is sliced — so bars break on local midnight and local hour boundaries in any zone, half-hour offsets included, not on UTC edges. The window 'since' filter stays on the raw UTC column: the window is an absolute span, only the labelling is local. The old caller-side current-offset histogram rotation is gone, and _fill_days / _fill_hours and the axis tick labels now walk local wall-clock keys to match. Tests derive their expected local buckets through the same rotation so they hold in any runner zone.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 4.8
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