DateTime extension for formatting dates seven ways to Sunday ("EEEE") using the intl library

date_utils.dart

import 'package:intl/intl.dart';

// https://pub.dev/documentation/intl/latest/intl/DateFormat-class.html
extension DateTimeFormattingExtensions on DateTime {
  // Existing methods
  String get day => DateFormat('d').format(this); // e.g., "6"
  String get abbrWeekday => DateFormat('E').format(this); // e.g., "Thu"
  String get weekday => DateFormat('EEEE').format(this); // e.g., "Thursday"
  String get abbrStandaloneMonth => DateFormat('LLL').format(this); // e.g., "Jun"
  String get standaloneMonth => DateFormat('LLLL').format(this); // e.g., "June"
  String get numMonth => DateFormat('M').format(this); // e.g., "6"
  String get numMonthDay => DateFormat('Md').format(this); // e.g., "6/6"
  String get numMonthWeekdayDay => DateFormat('MEd').format(this); // e.g., "Thu, 6/6"
  String get abbrMonth => DateFormat('MMM').format(this); // e.g., "Jun"
  String get abbrMonthDay => DateFormat('MMMd').format(this); // e.g., "Jun 6"
  String get abbrMonthWeekdayDay => DateFormat('MMMEd').format(this); // e.g., "Thu, Jun 6"
  String get month => DateFormat('MMMM').format(this); // e.g., "June"
  String get monthDay => DateFormat('MMMMd').format(this); // e.g., "June 6"
  String get monthWeekdayDay => DateFormat('MMMMEEEEd').format(this); // e.g., "Thursday, June 6"
  String get abbrQuarter => DateFormat('QQQ').format(this); // e.g., "Q2"
  String get quarter => DateFormat('QQQQ').format(this); // e.g., "2nd quarter"
  String get year => DateFormat('y').format(this); // e.g., "2024"
  String get yearNumMonth => DateFormat('yM').format(this); // e.g., "6/2024"
  String get yearNumMonthDay => DateFormat('yMd').format(this); // e.g., "6/6/2024"
  String get yearNumMonthWeekdayDay => DateFormat('yMEd').format(this); // e.g., "Thu, 6/6/2024"
  String get yearAbbrMonth => DateFormat('yMMM').format(this); // e.g., "Jun 2024"
  String get yearAbbrMonthDay => DateFormat('yMMMd').format(this); // e.g., "Jun 6, 2024"
  String get yearAbbrMonthWeekdayDay => DateFormat('yMMMEd').format(this); // e.g., "Thu, Jun 6, 2024"
  String get yearMonth => DateFormat('yMMMM').format(this); // e.g., "June 2024"
  String get yearMonthDay => DateFormat('yMMMMd').format(this); // e.g., "June 6, 2024"
  String get yearMonthWeekdayDay => DateFormat('yMMMMEEEEd').format(this); // e.g., "Thursday, June 6, 2024"
  String get yearAbbrQuarter => DateFormat('yQQQ').format(this); // e.g., "Q2 2024"
  String get yearQuarter => DateFormat('yQQQQ').format(this); // e.g., "2nd quarter 2024"
  String get hour24 => DateFormat('H').format(this); // e.g., "14"
  String get hour24Minute => DateFormat('Hm').format(this); // e.g., "14:30"
  String get hour24MinuteSecond => DateFormat('Hms').format(this); // e.g., "14:30:45"
  String get hour => DateFormat('j').format(this); // e.g., "2 PM"
  String get hourMinute => DateFormat('jm').format(this); // e.g., "2:30 PM"
  String get hourMinuteSecond => DateFormat('jms').format(this); // e.g., "2:30:45 PM"
  String get minute => DateFormat('m').format(this); // e.g., "30"
  String get minuteSecond => DateFormat('ms').format(this); // e.g., "30:45"
  String get second => DateFormat('s').format(this); // e.g., "45"

  // Additional common date formats
  String get mmddyyyy => DateFormat('MM/dd/yyyy').format(this); // e.g., "06/06/2024"
  String get ddmmyyyy => DateFormat('dd/MM/yyyy').format(this); // e.g., "06/06/2024"
  String get yyyymmdd => DateFormat('yyyy-MM-dd').format(this); // e.g., "2024-06-06"
  String get fullDate => DateFormat('EEEE, MMMM d, yyyy').format(this); // e.g., "Thursday, June 6, 2024"
  String get monthDayYear => DateFormat('MMMM d, yyyy').format(this); // e.g., "June 6, 2024"
  String get monthAbbrDayYear => DateFormat('MMM d, yyyy').format(this); // e.g., "Jun 6, 2024"
  String get shortDate => DateFormat('M/d/yy').format(this); // e.g., "6/6/24"
  String get iso8601 => DateFormat('yyyy-MM-ddTHH:mm:ss').format(this); // e.g., "2024-06-06T14:30:45"

  // Helper method to get day with ordinal suffix (e.g., 1st, 2nd, 3rd)
  String get dayWithSuffix {
    int dayNum = this.day;
    String suffix;

    if (dayNum >= 11 && dayNum <= 13) {
      suffix = 'th';
    } else {
      switch (dayNum % 10) {
        case 1:
          suffix = 'st';
          break;
        case 2:
          suffix = 'nd';
          break;
        case 3:
          suffix = 'rd';
          break;
        default:
          suffix = 'th';
      }
    }
    return '$dayNum$suffix'; // e.g., "6th"
  }

  // Format: June 6th, 2024
  String get monthDaySuffixYear {
    String month = DateFormat('MMMM').format(this); // e.g., "June"
    String daySuffix = this.dayWithSuffix; // e.g., "6th"
    String year = DateFormat('yyyy').format(this); // e.g., "2024"
    return '$month $daySuffix, $year'; // e.g., "June 6th, 2024"
  }

  // Additional time formats
  String get hourMinuteAmPm => DateFormat('hh:mm a').format(this); // e.g., "02:30 PM"
  String get hourMinuteSecondAmPm => DateFormat('hh:mm:ss a').format(this); // e.g., "02:30:45 PM"
  String get time24Hour => DateFormat('HH:mm').format(this); // e.g., "14:30"
  String get time24HourWithSeconds => DateFormat('HH:mm:ss').format(this); // e.g., "14:30:45"
}