DateTime Extensions

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import 'package:intl/intl.dart';
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extension DateTimeX on DateTime {
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  // Formatting
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  String format(String pattern) => DateFormat(pattern).format(this);
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  String get toReadable     => format('MMM d, yyyy');
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  String get toReadableFull => format('MMMM d, yyyy');
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  String get toTime         => format('h:mm a');
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  String get toDateTime     => format('MMM d, yyyy · h:mm a');
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  String get toIso8601      => toIso8601String();
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  // Relative time (e.g. "2 hours ago")
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  String get timeAgo {
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    final now = DateTime.now();
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    final diff = now.difference(this);
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    if (diff.inSeconds < 60)  return 'just now';
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    if (diff.inMinutes < 60)  return '${diff.inMinutes}m ago';
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    if (diff.inHours < 24)    return '${diff.inHours}h ago';
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    if (diff.inDays < 7)      return '${diff.inDays}d ago';
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    if (diff.inDays < 30)     return '${(diff.inDays / 7).floor()}w ago';
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    if (diff.inDays < 365)    return '${(diff.inDays / 30).floor()}mo ago';
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    return '${(diff.inDays / 365).floor()}y ago';
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  }
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  // Checks
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  bool get isToday    => _isSameDay(this, DateTime.now());
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  bool get isYesterday => _isSameDay(this, DateTime.now().subtract(const Duration(days: 1)));
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  bool get isTomorrow => _isSameDay(this, DateTime.now().add(const Duration(days: 1)));
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  bool get isPast     => isBefore(DateTime.now());
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  bool get isFuture   => isAfter(DateTime.now());
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  // Start/end of day
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  DateTime get startOfDay => DateTime(year, month, day);
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  DateTime get endOfDay   => DateTime(year, month, day, 23, 59, 59, 999);
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  static bool _isSameDay(DateTime a, DateTime b) =>
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      a.year == b.year && a.month == b.month && a.day == b.day;
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}
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// Usage
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DateTime.now().timeAgo;             // 'just now'
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DateTime(2024, 1, 15).toReadable;   // 'Jan 15, 2024'
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DateTime.now().isToday;             // true