feat(core): add toLocalISOString function to Date prototype

npm/ng-packs/packages/core/src/lib/core.module.ts

@@ -28,6 +28,7 @@ import { ConfigState } from './states/config.state';
 import { ProfileState } from './states/profile.state';
 import { SessionState } from './states/session.state';
 import { getInitialData, localeInitializer } from './utils/initial-utils';
+import './utils/date-extensions';
 
 @NgModule({
   imports: [

npm/ng-packs/packages/core/src/lib/utils/date-extensions.ts

@@ -0,0 +1,13 @@
+export {};
+
+declare global {
+  interface Date {
+    toLocalISOString(): string;
+  }
+}
+
+Date.prototype.toLocalISOString = function(this: Date): string {
+  const timezoneOffset = this.getTimezoneOffset();
+
+  return new Date(this.getTime() - timezoneOffset * 60000).toISOString();
+};