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lib/core/utils/date_utils.dart

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+import 'package:intl/intl.dart';
+
+abstract final class AppDateUtils {
+  static final _dateFormat = DateFormat('yyyy-MM-dd');
+  static final _dateTimeFormat = DateFormat('yyyy-MM-dd HH:mm:ss');
+  static final _timeFormat = DateFormat('HH:mm');
+  static final _koreanDateFormat = DateFormat('yyyy년 MM월 dd일');
+
+  static String formatDate(DateTime date) => _dateFormat.format(date);
+
+  static String formatDateTime(DateTime date) => _dateTimeFormat.format(date);
+
+  static String formatTime(DateTime date) => _timeFormat.format(date);
+
+  static String formatKoreanDate(DateTime date) => _koreanDateFormat.format(date);
+
+  static DateTime? tryParse(String? dateString) {
+    if (dateString == null) return null;
+    try {
+      return DateTime.parse(dateString);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  static String timeAgo(DateTime date) {
+    final now = DateTime.now();
+    final diff = now.difference(date);
+
+    if (diff.inDays > 365) {
+      return '${diff.inDays ~/ 365}년 전';
+    } else if (diff.inDays > 30) {
+      return '${diff.inDays ~/ 30}개월 전';
+    } else if (diff.inDays > 0) {
+      return '${diff.inDays}일 전';
+    } else if (diff.inHours > 0) {
+      return '${diff.inHours}시간 전';
+    } else if (diff.inMinutes > 0) {
+      return '${diff.inMinutes}분 전';
+    } else {
+      return '방금 전';
+    }
+  }
+}