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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"deps: ICU tzdata needs update to 2026a for America/Vancouver (BC permanent DST)","articleBody":"### Version\n\nv25.8.1\n\n### Platform\n\n```text\nLinux wp10 6.17.0-19-generic #19-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar  6 14:02:58 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux\n```\n\n### Subsystem\n\n_No response_\n\n### What steps will reproduce the bug?\n\nBritish Columbia adopted permanent DST effective November 1, 2026. Node.js currently has `America/Vancouver` falling back to PST (UTC-8) that day, which will be incorrect. You can verify the bug after November 1, 2026:\n\n```js\nnode -e \"console.log(process.versions.tz)\"  // shows current tzdata version\nnode -e \"console.log(new Intl.DateTimeFormat('en-CA', {\n  timeZone: 'America/Vancouver',\n  timeZoneName: 'short',\n  year: 'numeric', month: '2-digit', day: '2-digit',\n  hour: '2-digit', minute: '2-digit'\n}).format(new Date('2026-11-01T09:00:00Z')))\"\n// Expected on patched Node:  2026-11-01, 02:00 PDT\n// Actual on unpatched Node:  2026-11-01, 01:00 PST  ← wrong\n```\n\nRoot cause: The bundled ICU tzdata predates IANA 2026a (released 2026-03-01), which includes the `America/Vancouver` rule change. Reference: https://github.com/eggert/tz/commit/8b46071fd85a7a9434d63894bac64d30362cc16d\n\nNote also [ICU 78.3](https://github.com/unicode-org/icu/releases/tag/release-78.3) mentions updates to timezone data 2026a\n\nFix: Update `deps/icu-small` to include tzdata 2026a per the process documented in [maintaining-icu.md](https://github.com/nodejs/node/blob/main/doc/contributing/maintaining/maintaining-icu.md#time-zone-data).\n\nUrgency: The detonation date is November 1, 2026, so there is time, but backports to LTS lines (v22.x, v24.x) will be needed.\n\n### How often does it reproduce? Is there a required condition?\n\nAlways reproducible, no required conditions\n\n### What is the expected behavior? Why is that the expected behavior?\n\n```\n$ node -e \"console.log(process.versions.tz)\"\n2026a\n$ node -e \"console.log(new Intl.DateTimeFormat('en-CA', {\n  timeZone: 'America/Vancouver',\n  timeZoneName: 'short',\n  year: 'numeric', month: '2-digit', day: '2-digit',\n  hour: '2-digit', minute: '2-digit'\n}).format(new Date('2026-11-01T09:00:00Z')))\"\n2026-11-01, 02:00 a.m. MST\n$\n```\n\n### What do you see instead?\n\n```\n$ node -e \"console.log(process.versions.tz)\"\n2025c\n$ node -e \"console.log(new Intl.DateTimeFormat('en-CA', {\n  timeZone: 'America/Vancouver',\n  timeZoneName: 'short',\n  year: 'numeric', month: '2-digit', day: '2-digit',\n  hour: '2-digit', minute: '2-digit'\n}).format(new Date('2026-11-01T09:00:00Z')))\"\n2026-11-01, 01:00 a.m. PST\n$\n```\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/mjradwin","@type":"Person","name":"mjradwin"},"datePublished":"2026-03-18T16:54:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/62323/node/issues/62323"}