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fix(working-hours): do closed-day math in the preference zone - #2908
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The last device-zone leak on web, and the one the new working-hours rule points
at. `calculateBusinessHoursDuration` and `calculateEffectiveEndDate` walk a
booking day by day asking "is this day open?", but read the calendar day and
weekday off the DEVICE clock via `format(...,"yyyy-MM-dd")` and `.getDay()`, and
cut each day at `setHours(0,0,0,0)` — device midnight.
`calculateBusinessHoursDuration` is live: it feeds max-booking-length validation
when `maxBookingLengthSkipClosedDays` is on. So a user whose device differs from
their preference zone had closed hours attributed to the wrong days and got the
wrong limit enforced. Both now take the zone and resolve days through the shared
`resolveDaySchedule`, with `startOf("day")` taking midnight as the wall-clock
boundary it is.
This also fixes the two tests in this file that failed under `TZ=Asia/Tokyo`
while passing on UTC CI — green in CI, wrong in production, which is exactly how
this survived. The suite now passes identically under UTC, Asia/Tokyo and
America/Chicago.
Added two cases that pass the SAME instants through two zones and assert
different results, so a zone-ignoring build cannot satisfy them:
- 8 hours spanning UTC's Friday→Saturday midnight is 4 business hours in UTC
(half of it lands on an open Friday) but 0 in Asia/Tokyo, where the whole
window is a closed Saturday.
- The same span counts 1 closed day in UTC and 2 in Asia/Tokyo, so the extended
end date differs by a day.
Verified by mutation: forcing both walks to `setZone("utc")` while keeping the
parameter fails both cases. `addDays` and `format` are now unused here — the file
has no device-local date arithmetic left.
Note `calculateEffectiveEndDate` has NO production callers; it is exported and
tested but used nowhere. Fixed rather than deleted so the file stays coherent and
its tests keep passing, but it is a candidate for removal — flagged rather than
decided here.
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. WalkthroughWorking-hours date and duration calculations now accept explicit IANA time zones. Booking validation passes the acting user’s resolved time zone. Tests cover UTC, Asia/Tokyo, closed days, and overrides. ChangesTimezone-aware working-hours calculations
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The PR corrects closed-day calculations in the preference time zone, preventing incorrect booking-duration limits for users whose device zone differs. It is mergeable with explicit owner follow-up on the test fixture’s repository factory-pattern convention. Possibly related PRs
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Actionable comments posted: 1
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Inline comments:
In `@apps/webapp/app/modules/working-hours/utils.test.ts`:
- Around line 805-817: Replace the inline weekdaysOpen WorkingHoursData fixture
with the existing working-hours test factory or shared fixture helper, while
retaining this test’s weekday configuration and case-specific 09:00–17:00 time
range through the factory inputs or targeted overrides.
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apps/webapp/app/components/booking/forms/forms-schema.tsapps/webapp/app/modules/working-hours/utils.test.tsapps/webapp/app/modules/working-hours/utils.ts
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…elpers `calculateBusinessHoursDuration` and `calculateEffectiveEndDate` gained a `timeZone` parameter in 15d39d9, but their JSDoc still described the old three- and four-argument signatures. CLAUDE.md requires a `@param` for every parameter, and the omission is worse than usual here: the whole point of the argument is that the zone must be passed explicitly rather than inferred, so a docblock that does not mention it invites the next caller to wonder what to pass. Both now state the contract and point at `.claude/rules/working-hours-are-location-local.md` for why the acting user's resolved preference zone is the accepted proxy — and why leaving the day boundary to the ambient clock is strictly worse than a viewer zone, since that resolves to the device in the browser but UTC on the server, so one submission could be judged in two different zones on the two sides of the same validation. Found by the Codex review on #2908.
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Aug 24, 2026
…te's (#252) * content: booking times follow your clock, working hours follow the site's Triggered by: Shelf-nu/shelf.nu#2896 Shelf-nu/shelf.nu#2905 Shelf-nu/shelf.nu#2907 Shelf-nu/shelf.nu#2908 The working-hours article never mentioned time zones at all, while the date-preferences article told readers every timestamp follows their own clock. Working hours are the one thing that does not: they are the local hours of the physical location. #2907 put that in the product; this puts it on the site. The same article also sent readers to a Working Hours sidebar item that does not exist, promised the picker greys out unavailable times, said every day of a multi-day booking is checked, and offered an override edit that was never built. All four corrected against source. * content: the opening window is judged in the booker's zone, and an override is a date CodeRabbit review on #252, both findings. The 'everything else is a moment in time' claim was too broad: a closed-day override is a calendar date, which the same article says two sections above. On the second, the suggestion's premise did not hold, so the fix is different from what was proposed. validateWorkingHours reads the weekday, the wall-clock time and the date from prefs.timeZone (forms-schema.ts:303, :322), the booking user's own preference. There is no site-local validation to apply, so matching the site's zone is not optional decoration. The real hazard CodeRabbit was pointing at is that the preference is account-wide, so the paragraph now states the consequence, names the case where you should NOT change it, and quotes the three refusal messages. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Carlos Virreira <macwhale@Carlos-MacBook-Pro.local> Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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The last device-zone leak on web, and the one
.claude/rules/working-hours-are-location-local.md(#2907) points at.calculateBusinessHoursDurationandcalculateEffectiveEndDatewalk a booking day by day asking "is this day open?" — but read the calendar day and weekday off the device clock viaformat(…, "yyyy-MM-dd")and.getDay(), and cut each day atsetHours(0, 0, 0, 0), i.e. device midnight.calculateBusinessHoursDurationis live: it feeds max-booking-length validation whenmaxBookingLengthSkipClosedDaysis enabled. So a user whose device differs from their preference zone had closed hours attributed to the wrong days and the wrong limit enforced against them.Both now take the zone and resolve days through the shared
resolveDaySchedule, withstartOf("day")treating midnight as the wall-clock boundary it actually is.The CI blind spot this closes
Two cases in
working-hours/utils.test.tsfailed underTZ=Asia/Tokyoand passed under UTC. CI runs UTC, so the suite stayed green while the code was wrong for anyone east of it — which is exactly how this survived three prior timezone PRs.The suite now passes identically under UTC, Asia/Tokyo and America/Chicago.
Tests that can't pass by accident
Both new cases push the same instants through two zones and assert different results, so a build that ignores the zone parameter cannot satisfy them:
Asia/Tokyo, where the whole window is a closed Saturday.Asia/Tokyo, so the extended end date differs by a day.Verified by mutation, not just by passing: forcing both walks to
setZone("utc")while keeping the parameter fails both cases. That is the check the earlier zone tests in this file lacked, per the #2905 review.addDaysandformatare now unused here — the file has no device-local date arithmetic left.One thing to decide
calculateEffectiveEndDatehas no production callers. It is exported, has 7 tests, and is used nowhere inapps/orpackages/. I fixed it so the file stays coherent and its tests keep passing, rather than delete a public export unilaterally — but it is a strong candidate for removal. Happy to drop it and its tests in a follow-up commit here if you'd rather.Verification
Out of scope
The companion picker/display split (device-local picker, preference-zone detail view) is deliberately not here — it needs picker, display and serialisation changed together and ships on the native release train after a webapp deploy, so bundling it would couple two things that deploy at different times.
Completes the series: #2896 (decode) → #2905 (produce) → #2907 (the rule) → this.
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