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src/app/utils/date.ts

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+export class UDate {
+  static GetDateWithTimeZone(Date: Date) {
+    let date = Date;
+
+    const tzOffset = -date.getTimezoneOffset(); // in minutes
+    const diff = tzOffset >= 0 ? '+' : '-';
+    const pad = (n: number) => (n < 10 ? '0' : '') + n;
+
+    return date.getFullYear() +
+        '-' + pad(date.getMonth() + 1) +
+        '-' + pad(date.getDate()) +
+        'T' + pad(date.getHours()) +
+        ':' + pad(date.getMinutes()) +
+        ':' + pad(date.getSeconds()) +
+        diff + pad(Math.floor(Math.abs(tzOffset) / 60)) +
+        ':' + pad(Math.abs(tzOffset) % 60);
+  }
+}

src/app/utils/task-scheduler.ts

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+import { Injectable } from '@angular/core';
+import { timer, Subscription } from 'rxjs';
+
+/**
+ * Interface representing a cron job.
+ */
+interface CronJob {
+  name: string;
+  timeExecute: Date;
+  callbackFunction: () => void;
+  subscription: Subscription;
+}
+
+/**
+ * Service to manage cron jobs using RxJS. Allows scheduling, replacing, and
+ * removing jobs that execute a callback function at a specified time.
+ */
+@Injectable({
+  providedIn: 'root',
+})
+export class CronJobService {
+  /**
+   * A map to store cron jobs with a key composed of the job name and execution time.
+   */
+  private jobs: Map<string, CronJob> = new Map();
+
+  /**
+   * Generates a unique key for a cron job based on its name and execution time.
+   * @param name - The name of the cron job.
+   * @param timeExecute - The time when the job should execute.
+   * @returns A string key combining the name and timeExecute.
+   */
+  private generateJobKey(name: string, timeExecute: Date): string {
+    return `${name}_${timeExecute.getTime()}`;
+  }
+
+  /**
+   * Creates a new cron job or replaces an existing one if the job with the same
+   * name and execution time already exists. The job will execute the provided
+   * callback function at the specified time.
+   *
+   * @param name - The name of the cron job.
+   * @param timeExecute - The time when the job should execute.
+   * @param callbackFunction - The function to be called when the job executes.
+   */
+  createCronJob(name: string, timeExecute: Date, callbackFunction: () => void) {
+    const now = new Date();
+    const delay = timeExecute.getTime() - now.getTime();
+
+    if (delay < 0) {
+      console.error('Time to execute is in the past!');
+      return;
+    }
+
+    const jobKey = this.generateJobKey(name, timeExecute);
+
+    // If the job already exists, replace it
+    if (this.jobs.has(jobKey)) {
+      this.removeCronJob(name, timeExecute);
+    }
+
+    // Create a new timer and store the subscription
+    const subscription = timer(delay).subscribe(() => {
+      callbackFunction();
+      this.removeCronJob(name, timeExecute);
+    });
+
+    this.jobs.set(jobKey, { name, timeExecute, callbackFunction, subscription });
+  }
+
+  /**
+   * Removes a cron job by its name and execution time.
+   *
+   * @param name - The name of the cron job.
+   * @param timeExecute - The time when the job was supposed to execute.
+   */
+  removeCronJob(name: string, timeExecute: Date) {
+    const jobKey = this.generateJobKey(name, timeExecute);
+    const job = this.jobs.get(jobKey);
+    if (job) {
+      job.subscription.unsubscribe();
+      this.jobs.delete(jobKey);
+    }
+  }
+
+  /**
+   * Retrieves all currently scheduled cron jobs.
+   *
+   * @returns An array of all scheduled cron jobs.
+   */
+  getCronJobs(): CronJob[] {
+    return Array.from(this.jobs.values());
+  }
+
+  /**
+   * Removes all cron jobs with the specified name, regardless of their execution time.
+   *
+   * @param name - The name of the cron jobs to remove.
+   */
+  removeAllJobsByName(name: string) {
+    for (const [key, job] of this.jobs) {
+      if (job.name === name) {
+        job.subscription.unsubscribe();
+        this.jobs.delete(key);
+      }
+    }
+  }
+}