Date Formatter

type FormatPattern = 'short' | 'long' | 'iso' | 'relative' | string;class DateFormatter {  private locale: string;  private timezone: string;  constructor(locale: string = 'en-US', timezone: string = 'UTC') {    this.locale = locale;    this.timezone = timezone;  }  format(date: Date, pattern: FormatPattern = 'short'): string {    if (pattern === 'short') {      return date.toLocaleDateString(this.locale, { timeZone: this.timezone });    }    if (pattern === 'long') {      return date.toLocaleString(this.locale, {         timeZone: this.timezone,        dateStyle: 'full',        timeStyle: 'long'      });    }    if (pattern === 'iso') {      return date.toISOString();    }    if (pattern === 'relative') {      return this.formatRelative(date);    }    return this.formatCustom(date, pattern);  }  private formatRelative(date: Date): string {    const now = new Date();    const diff = now.getTime() - date.getTime();    const seconds = Math.floor(diff / 1000);    const minutes = Math.floor(seconds / 60);    const hours = Math.floor(minutes / 60);    const days = Math.floor(hours / 24);    if (days > 0) return `${days} day${days > 1 ? 's' : ''} ago`;    if (hours > 0) return `${hours} hour${hours > 1 ? 's' : ''} ago`;    if (minutes > 0) return `${minutes} minute${minutes > 1 ? 's' : ''} ago`;    return 'just now';  }  private formatCustom(date: Date, pattern: string): string {    const year = date.getFullYear();    const month = String(date.getMonth() + 1).padStart(2, '0');    const day = String(date.getDate()).padStart(2, '0');    const hours = String(date.getHours()).padStart(2, '0');    const minutes = String(date.getMinutes()).padStart(2, '0');    const seconds = String(date.getSeconds()).padStart(2, '0');    return pattern      .replace('YYYY', String(year))      .replace('MM', month)      .replace('DD', day)      .replace('HH', hours)      .replace('mm', minutes)      .replace('ss', seconds);  }}export default DateFormatter;

import DateFormatter from './dateFormatter';const formatter = new DateFormatter('en-US', 'UTC');const date = new Date('2024-01-15T10:30:00Z');console.log('Short:', formatter.format(date, 'short'));console.log('Long:', formatter.format(date, 'long'));console.log('ISO:', formatter.format(date, 'iso'));console.log('Relative:', formatter.format(date, 'relative'));console.log('Custom:', formatter.format(date, 'YYYY-MM-DD HH:mm:ss'));