timezone service refactoring

npm/ng-packs/packages/core/src/lib/interceptors/timezone.interceptor.ts

@@ -3,7 +3,9 @@ import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/c
 import { TimezoneService } from '../services';
 import { Observable } from 'rxjs';
 
-@Injectable()
+@Injectable({
+  providedIn: 'root',
+})
 export class TimezoneInterceptor implements HttpInterceptor {
   protected readonly timezoneService = inject(TimezoneService);
 

npm/ng-packs/packages/core/src/lib/services/timezone.service.ts

@@ -1,10 +1,21 @@
-import { Injectable } from '@angular/core';
+import { inject, Injectable } from '@angular/core';
+import { DOCUMENT } from '@angular/common';
+import { ConfigStateService } from './config-state.service';
 
 @Injectable({
   providedIn: 'root',
 })
 export class TimezoneService {
+  protected readonly configState = inject(ConfigStateService);
+  protected readonly document = inject(DOCUMENT);
   private readonly cookieKey = '__timezone';
+  private timeZoneNameFromSettings: string | null | undefined;
+
+  constructor() {
+    this.configState.getOne$('timing').subscribe(timezoneSettings => {
+      this.timeZoneNameFromSettings = timezoneSettings?.timeZone?.iana?.timeZoneName;
+    });
+  }
 
   getBrowserTimezone(): string {
     return Intl.DateTimeFormat().resolvedOptions().timeZone;
@@ -12,11 +23,11 @@ export class TimezoneService {
 
   getTimezone(): string {
     const fromCookie = this.getCookie(this.cookieKey);
-    return fromCookie || this.getBrowserTimezone();
+    return this.timeZoneNameFromSettings || fromCookie || this.getBrowserTimezone();
   }
 
   setTimezone(timezone: string): void {
-    document.cookie = `${this.cookieKey}=${timezone}; path=/`;
+    this.document.cookie = `${this.cookieKey}=${timezone}; path=/`;
   }
 
   convertUtcToLocal(date: string | Date): Date {
@@ -28,7 +39,7 @@ export class TimezoneService {
   }
 
   private getCookie(name: string): string | null {
-    const match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
+    const match = this.document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
     return match ? decodeURIComponent(match[2]) : null;
   }
 }