All files / src/app/components/countdown countdown.component.ts

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import { NgIf } from '@angular/common';
import { Component, Input, OnChanges, OnDestroy, OnInit } from '@angular/core';
import { interval, Subscription } from 'rxjs';
 
@Component({
  selector: 'app-countdown',
  imports: [NgIf],
  templateUrl: './countdown.component.html',
  styleUrl: './countdown.component.scss'
})
export class CountdownComponent implements OnInit, OnChanges, OnDestroy{
 
  @Input() targetTimestamp: number|null = null;
  days: number | null = null;
  hours: number | null = null;
  minutes: number | null = null;
  seconds: number | null = null;
  private subscription: Subscription | null = null;
  isPositiveTime = false;
  targetDate: Date | null = null;
  localTimeZone: string;
  localMonth: string;
  UTCMonth: string;
 
  ngOnInit() {
    this.targetTimestamp = null;
    this.updateTarget();
    this.updateTime();
    this.subscription = interval(100).subscribe(() => this.updateTime());
    this.localTimeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
  }
 
  ngOnChanges(){
    this.updateTarget();
    this.updateTime();
  }
 
  ngOnDestroy() {
    this.subscription?.unsubscribe();
  }
 
  private updateTime() {
    const now = Math.floor(Date.now() / 1000);
    if (this.targetTimestamp !== null){
      let diff = this.targetTimestamp - now;
 
      this.isPositiveTime = diff < 0;
      if (this.isPositiveTime) {
        diff = -diff;
      }
 
      this.days = Math.floor(diff / 86400);
      this.hours = Math.floor((diff % 86400) / 3600);
      this.minutes = Math.floor((diff % 3600) / 60);
      this.seconds = Math.floor(diff % 60);
    }
    else{
      this.days = null;
      this.hours = null;
      this.minutes = null;
      this.seconds = null;
    }
  }
 
  formatNumber(value: number | null): string {
    Iif (value === null){
      return '--';
    }
    return value < 10 ? '0' + value : value.toString();
  }
 
  updateTarget(){
    if (this.targetTimestamp !== null){
      this.targetDate = new Date(this.targetTimestamp*1000);
 
      this.localMonth = this.targetDate.toLocaleString('en-US', { month: 'long' });
      this.UTCMonth = this.targetDate.toLocaleString('en-US', { month: 'long', timeZone: 'UTC' });
    }
    else{
      this.targetDate = null;
 
    }
 
  }
 
}