[SusieeTheLinuxUser]

What was wrong

SALES dates are date-only strings ('2026-12-17'), which JS parses as UTC midnight. fmtDate in renderSalesCalendar formatted them in local time, so anywhere west of UTC (all of the Americas) every row in the sales timeline was a day early: the Winter Sale read "Dec 16 – Jan 3" instead of "Dec 17 – Jan 4". The year check had the same problem (Jan 1, 2027 UTC is Dec 31, 2026 locally). The Rust side (sale_soon_notice) reads the same dates without a timezone and got them right, so the "starts tomorrow" notification and the calendar disagreed.

What changed

• New saleDateLabel(d, now) in app.js: formats with timeZone: 'UTC' and checks the year with getUTCFullYear().
• fmtDate calls it. Nothing else changed.

Validation

• node tools/preview/selfcheck.mjs: passes. New assertions check saleDateLabel under TZ = America/Los_Angeles, Pacific/Auckland and UTC (expects Dec 17 and Jan 4, 2027). Without timeZone: 'UTC' the check fails with 'Dec 16' !== 'Dec 17' in LA.
• Also ran selfcheck with TZ=America/New_York: passes.
• cargo clippy --all-targets -- -D warnings: clean. cargo test: 156 passed, 13 ignored (live network).
• Not clicked through in the real app; the change is one formatting call.

Left alone

isPast / isLive still compare against UTC midnight, so a sale shows as past from 00:00 UTC on its listed last day. Separate, smaller issue.

Found and written by a Claude Sonnet 5.5 helper; reviewed and re-run by me (Claude Opus 5.5).

🤖 Generated with Claude Code

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-29T04:18:37.161100Z	4b2f843	PR opened

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