America/Asuncion still on UTC-4 #57782

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1. avivkeller commented on Apr 7, 2025

   

   avivkeller

   on Apr 7, 2025

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   Node.js gets it's timezone data from ICU, and it not directly responsible for the timezones presented.
2. LiviaMedeiros commented on Apr 7, 2025

   

   LiviaMedeiros

   on Apr 7, 2025

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   In the main branch with built-in full-icu, this is already resolved:

   [Main] Node version 24.0.0-pre
   [Main] In timezone: America/Asuncion UTC-3

   > console.log(process.versions.icu);
   77.1

   The PR that fixes this is #57455 which is not included in release yet.

   An alternative solution is building Node.js locally with --with-intl=system-icu flag and providing system-wide ICU with newer version.

   Closing this as resolved, feel free to reopen if this doesn't look right.
3. LiviaMedeiros

   closed this as completedon Apr 7, 2025
4. aza547 commented on Apr 7, 2025

   

   aza547

   on Apr 7, 2025

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   Hmm thanks - I do seem to have a different ICU version (74.2).

   I saw that #57685 was in the Node 20.19.0 tag, which describes the time zone change in question, guess the PR you linked is also required.

   Anyway - thanks for the response. I'll sit tight till there is a new release I can pick up.

   👍React with 👍1Reacted by Livia Medeiros
5. richardlau commented on Apr 7, 2025

   

   richardlau

   on Apr 7, 2025

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   20.19.0 from https://nodejs.org/dist/v20.19.0/node-v20.19.0-win-x64.zip appears to give the expected result for me:

   C:\Users\rlau>node --version
   v20.19.0
   
   C:\Users\rlau>type test.js
   const tz = Intl.DateTimeFormat().resolvedOptions().timeZone;
   const tzOffset = new Date().getTimezoneOffset() * -1; // Offset is wrong direction so flip it.
   const tzOffsetStr = `UTC${tzOffset >= 0 ? '+' : ''}${tzOffset / 60}`;
   
   console.info('[Main] Node version', process.versions.node);
   console.info('[Main] In timezone:', tz, tzOffsetStr);
   C:\Users\rlau>set TZ=America/Asuncion
   
   C:\Users\rlau>node test.js
   [Main] Node version 20.19.0
   [Main] In timezone: America/Asuncion UTC-3
   
   C:\Users\rlau>node -p process.versions
   {
     node: '20.19.0',
     acorn: '8.14.0',
     ada: '2.9.2',
     ares: '1.34.4',
     brotli: '1.1.0',
     cjs_module_lexer: '1.4.1',
     cldr: '46.0',
     icu: '76.1',
     llhttp: '8.1.2',
     modules: '115',
     napi: '9',
     nghttp2: '1.61.0',
     nghttp3: '0.7.0',
     ngtcp2: '1.1.0',
     openssl: '3.0.15+quic',
     simdutf: '6.0.3',
     tz: '2025a',
     undici: '6.21.1',
     unicode: '16.0',
     uv: '1.46.0',
     uvwasi: '0.0.21',
     v8: '11.3.244.8-node.26',
     zlib: '1.3.0.1-motley-82a5fec'
   }
   
   C:\Users\rlau>
   
6. richardlau commented on Apr 7, 2025

   

   richardlau

   on Apr 7, 2025

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   Hmm thanks - I do seem to have a different ICU version (74.2).

   @aza547 You'll probably need to check with Electron which ICU they're using. If they're not using the one bundled in Node.js then they'll need to patch the timezones independently.

   👍React with 👍1Reacted by Alex Kershaw