Localization.getCalendars() gets an incorrect timezone on web

[ericbabbly]

Minimal reproducible example

https://snack.expo.dev/MlFZ4YUTbA

Summary

Affected platforms: web

Note: I'm in the America/Vancouver timezone, so the output may be different for people in different timezones. To repro this reliably, you must be in the America/Vancouver timezone.

In the above snack, the correct timezone (America/Vancouver) is calculated with getLocalizationAsync and Intl.DateTimeFormat().resolvedOptions().timeZone. When using Localization.getCalendars(), I get America/Adak, which is 2 hours behind my current timezone.

Environment

❯ npx expo-env-info
expo-env-info 1.0.5 environment info:
    System:
      OS: macOS 13.3
      Shell: 5.9 - /bin/zsh
    Binaries:
      Node: 16.15.1 - ~/.nvm/versions/node/v16.15.1/bin/node
      Yarn: 1.22.19 - /opt/homebrew/bin/yarn
      npm: 8.11.0 - ~/.nvm/versions/node/v16.15.1/bin/npm
      Watchman: 2023.01.02.00 - /opt/homebrew/bin/watchman
    Managers:
      CocoaPods: 1.11.3 - /opt/homebrew/bin/pod
    SDKs:
      iOS SDK:
        Platforms: DriverKit 22.2, iOS 16.2, macOS 13.1, tvOS 16.1, watchOS 9.1
    IDEs:
      Android Studio: Chipmunk 2021.2.1 Patch 1 Chipmunk 2021.2.1 Patch 1
      Xcode: 14.2/14C18 - /usr/bin/xcodebuild
    npmPackages:
      @expo/webpack-config: ^18.0.1 => 18.0.3 
      expo: ~48.0.10 => 48.0.10 
      react: 18.2.0 => 18.2.0 
      react-dom: 18.2.0 => 18.2.0 
      react-native: 0.71.6 => 0.71.6 
      react-native-web: ~0.18.10 => 0.18.12 
    npmGlobalPackages:
      expo-cli: 6.2.1
    Expo Workflow: managed

[expo-bot]

Thank you for filing this issue!
This comment acknowledges we believe this may be a bug and there’s enough information to investigate it.
However, we can’t promise any sort of timeline for resolution. We prioritize issues based on severity, breadth of impact, and alignment with our roadmap. If you’d like to help move it more quickly, you can continue to investigate it more deeply and/or you can open a pull request that fixes the cause.