Timezone changes are not correctly applied to NS runtime

[cjohn001]

Issue Description

When changing the timezone settings on iOS the locale seems to be changed, but the time is not set to the correct time for that timezone.

Here is an example on IOS from Date object:

Starting in London timezone: time: Mon Jun 05 2023 15:50:00 GMT+0100 (BST)

switching timezone to CEST (GMT+0200): time: Mon Jun 05 2023 15:50:15 GMT+0100 (CEST) --> you can see, time zone was switched but time is not updated to reflect time in timezone (should be +0200)

After restarting application the timezone is set up correctly. time: Mon Jun 05 2023 16:53:10 GMT+0200 (CEST)

Please note, I had an initial issue in the NS core repo

https://github.com/NativeScript/NativeScript/issues/10300

However, seems like the correct place is here. When setting:

 "android": {
        "handleTimeZoneChanges": true
  } 

like recommended here:

https://github.com/NativeScript/NativeScript/issues/10300#issuecomment-1584389309

things are working correctly on Android.

I tried also setting this flag for"ios", however, this had no effect.

Reproduction

console.log( new Date());

switch timezone via device settings

Workaround

The only workaround I have found so far is forcing the app to close. On restart the timezone settings or ok.

Environment

OS: macOS 13.4
CPU: (10) arm64 Apple M1 Pro
Shell: /bin/zsh
node: 18.12.1
npm: 8.19.2
nativescript: 8.5.3

# android
java: 11.0.18
ndk: Not Found
apis: Not Found
build_tools: Not Found
system_images: Not Found

# ios
xcode: 14.3.1/14E300c
cocoapods: 1.12.0
python: 3.11.2
python3: 3.11.2
ruby: 2.7.7
platforms: 
  - DriverKit 22.4
  - iOS 16.4
  - macOS 13.3
  - tvOS 16.4
  - watchOS 9.4

Dependencies

"dependencies": {
  "@angular/animations": "16.0.3",
  "@angular/common": "16.0.3",
  "@angular/compiler": "16.0.3",
  "@angular/core": "16.0.3",
  "@angular/forms": "16.0.3",
  "@angular/platform-browser": "16.0.3",
  "@angular/platform-browser-dynamic": "16.0.3",
  "@angular/router": "16.0.3",
  "@apollo/client": "3.7.14",
  "@mnd/external-web-view": "file:../mnd-plugins/dist/packages/external-web-view/mnd-external-web-view-1.0.0.tgz",
  "@nativescript/angular": "16.0.0",
  "@nativescript/core": "8.5.3",
  "@nativescript/iqkeyboardmanager": "2.1.1",
  "@nativescript/localize": "5.1.0",
  "@nativescript/mlkit-barcode-scanning": "2.0.0",
  "@nativescript/mlkit-core": "2.0.0",
  "@nativescript/secure-storage": "3.0.0",
  "@nativescript/theme": "3.0.2",
  "@nativescript/ui-charts": "0.2.4",
  "apollo-angular": "5.0.0",
  "apollo3-cache-persist": "0.14.1",
  "d3-ease": "3.0.1",
  "graphql": "16.6.0",
  "graphql-tag": "2.12.6",
  "intl": "1.2.5",
  "moment": "2.29.4",
  "nativescript-health-data": "file:../mnd-custom-plugins/nativescript-health-data/publish/package/nativescript-health-data-2.0.0.tgz",
  "nativescript-oauth2-ext": "file:../mnd-custom-plugins/nativescript-oauth2-ext/publish/package/nativescript-oauth2-ext-3.0.1.tgz",
  "nativescript-sqlite": "2.8.6",
  "nativescript-ui-calendar": "15.2.3",
  "nativescript-ui-gauge": "15.2.3",
  "rxjs": "7.8.1",
  "uuid": "9.0.0",
  "zone.js": "0.13.0"
},
"devDependencies": {
  "@angular-devkit/build-angular": "16.0.3",
  "@angular/compiler-cli": "16.0.3",
  "@graphql-codegen/cli": "4.0.0",
  "@graphql-codegen/fragment-matcher": "5.0.0",
  "@graphql-codegen/introspection": "4.0.0",
  "@graphql-codegen/typescript": "4.0.0",
  "@graphql-codegen/typescript-apollo-angular": "3.5.6",
  "@graphql-codegen/typescript-operations": "4.0.0",
  "@nativescript/android": "8.5.0",
  "@nativescript/ios": "8.5.2",
  "@nativescript/types": "8.5.0",
  "@nativescript/webpack": "5.0.14",
  "@ngtools/webpack": "16.0.3",
  "@types/d3-ease": "3.0.0",
  "@types/intl": "1.2.0",
  "@types/node": "20.2.5",
  "@types/uuid": "9.0.1",
  "keycloak-request-token": "0.1.0",
  "rimraf": "5.0.1",
  "sass": "1.62.1",
  "ts-node": "10.9.1",
  "typescript": "4.9.5"
}