https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=41129

--- Comment #359 from Paul Derscheid <[email protected]> ---
Created attachment 210444
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=210444&action=edit
Bug 41129: (QA follow-up) Keep booking day boundaries correct across DST

- toStartOfDayISO/toEndOfDayISO derived the boundary with
  dayjs.tz(...).startOf/endOf("day"), which the timezone plugin rounds
  through the browser's local time; around DST changes this lands on
  the wrong instant whenever the browser and library timezones differ
- A booking starting on 7 November 2027 (US DST end) was saved as
  6 November with a New York browser and a UTC library
- Parse midnight and 23:59:59.999 directly in the library timezone

Test plan:
1. Run: TZ=America/New_York yarn cypress run --component --spec
t/cypress/component/lib/booking/dates-timezone_spec.ts
2. Confirm it passes; without this patch the DST tests fail
3. Edit item type 'BK', check 'Bookable', save:
  
http://localhost:8081/cgi-bin/koha/admin/itemtypes.pl?op=add_form&itemtype=BK
4. In Chrome DevTools > Sensors, set 'Timezone ID' to 'America/New_York'
   (keep DevTools open)
5. On http://localhost:8081/cgi-bin/koha/catalogue/detail.pl?biblionumber=1
   click 'Place booking', select patron 'koha', pickup location
   'Centerville', item type 'Books'
6. Book 7 November 2027 to 10 November 2027
7. Confirm the 'Bookings' tab shows it starting on 7 November 2027

Assisted-by: Opus 5.5 (Anthropic)
Signed-off-by: Paul Derscheid <[email protected]>

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