The edit-params picker was showing "2026-06-22" for an expiry stored
as 2026-06-22T03:59:59Z because it sliced the UTC string. But that
UTC instant is actually 23:59 EDT on June 21 in Montreal, which is
what the email recipient sees (and what the operator picked).
Fixes both sides of the round-trip:
DISPLAY (UTC → picker)
- Convert stored ISO UTC to YYYY-MM-DD interpreted in America/Montreal
using en-CA locale (which returns ISO-style YYYY-MM-DD).
SAVE (picker → ISO UTC)
- New endOfDayMontreal() helper that probes Montreal's offset for the
target date (noon UTC always lands in morning Montreal, never spans
a day) and anchors at 23:59:59.999 local. Handles EDT/EST swaps
automatically — verified with edge cases 2026-03-08 (post-DST-spring),
2026-06-21 (mid-summer), 2026-11-01 (post-DST-fall), 2026-12-31 (winter).
Previously the save path relied on the BROWSER's local TZ inference
(new Date('YYYY-MM-DDT23:59:59').toISOString()) which is fine for
Quebec operators but quietly wrong for anyone editing from elsewhere.
The bulk email send was already correct because the worker's
toLocaleDateString uses timeZone: 'America/Montreal' (last commit).
This commit only fixes what the OPERATOR sees in the picker.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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