how can i change default timezone like 'UTC' whole application? Javascript, Angular

Question

I'm working on a Hotel application and the customers use UTC for communication. I completed mostly and I used everywhere date object like that => new Date() so before I run the application I want to change my local timezone like UTC and when I create new Date object it has to be UTC format. [![enter image description here]

I tried a lot of things, I tried tho expend Date object and when create date instance for everyone obejct I return our date instance. I didn't achieve. I have to get zimezone 0 of date object and I cant use any 3pr library.

providers: [{
  provide: APP_INITIALIZER,
  useFactory: initializeApp,
  multi: true
}...]

export function initializeApp() {return () => {
const a = Intl.DateTimeFormat()
console.log(a);
Intl.DateTimeFormat(['en-US'], {
  timeZone: 'UTC'
});
console.log(a);};}

Answer 1

To set the default timezone for your entire Angular application, you can use the LOCALE_ID provider along with the APP_INITIALIZER in Angular. Here's an example:

1. Import necessary modules in your app.module.ts:

import { NgModule, LOCALE_ID, APP_INITIALIZER } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule
  ],
  providers: [
    { provide: LOCALE_ID, useValue: 'en-US' }, // Set the default locale to 'en-US'
    {
      provide: APP_INITIALIZER,
      useFactory: initializeApp,
      multi: true,
      deps: [LOCALE_ID]
    }
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

2. Create your initializeApp function in a separate file or within your app.module.ts:

import { LOCALE_ID } from '@angular/core';

export function initializeApp(locale: string) {
  return async () => {
    try {
      await import(`@angular/common/locales/${locale}.js`);
    } catch (error) {
      console.error(`Error loading locale data for ${locale}`, error);
    }
  };
}

3. Adjust your main.ts file to use the locale from the LOCALE_ID provider:

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

if (environment.production) {
  enableProdMode();
}

document.addEventListener('DOMContentLoaded', () => {
  platformBrowserDynamic().bootstrapModule(AppModule, {
    providers: [
      { provide: LOCALE_ID, useValue: 'en-US' } // Set the default locale to 'en-US'
    ]
  })
  .catch(err => console.error(err));
});

In this example, the default locale is set to 'en-US', but you can change it to 'en-GB', 'fr-FR', or any other supported locale. The initializeApp function is used to load locale data dynamically.

Make sure to adjust the timezone and locale according to your requirements.