马良AI写作初始化仓库

AINoval/lib/utils/date_formatter.dart

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+import 'package:intl/intl.dart';
+
+class DateFormatter {
+  // 格式化为相对时间（如：昨天、2小时前等）
+  static String formatRelative(DateTime date) {
+    final now = DateTime.now();
+    final difference = now.difference(date);
+    
+    if (difference.inSeconds < 60) {
+      return '刚刚';
+    } else if (difference.inMinutes < 60) {
+      return '${difference.inMinutes}分钟前';
+    } else if (difference.inHours < 24) {
+      return '${difference.inHours}小时前';
+    } else if (difference.inDays < 7) {
+      return '${difference.inDays}天前';
+    } else if (date.year == now.year) {
+      return DateFormat('MM月dd日').format(date);
+    } else {
+      return DateFormat('yyyy年MM月dd日').format(date);
+    }
+  }
+  
+  // 格式化为月份字符串（用于分组显示）
+  static String formatMonth(DateTime date) {
+    final now = DateTime.now();
+    
+    if (date.year == now.year && date.month == now.month) {
+      return '本月';
+    } else if (date.year == now.year && date.month == now.month - 1) {
+      return '上个月';
+    } else if (date.year == now.year) {
+      return DateFormat('MM月').format(date);
+    } else {
+      return DateFormat('yyyy年MM月').format(date);
+    }
+  }
+  
+  // 格式化为完整日期时间
+  static String formatFull(DateTime date) {
+    return DateFormat('yyyy年MM月dd日 HH:mm').format(date);
+  }
+
+  static String formatDate(DateTime date) {
+    final months = ['January', 'February', 'March', 'April', 'May', 'June', 
+                   'July', 'August', 'September', 'October', 'November', 'December'];
+    final day = date.day;
+    final month = months[date.month - 1];
+    final year = date.year;
+    final hour = date.hour;
+    final minute = date.minute.toString().padLeft(2, '0');
+    final period = hour >= 12 ? 'PM' : 'AM';
+    final hour12 = hour > 12 ? hour - 12 : (hour == 0 ? 12 : hour);
+    
+    return '$month ${_getOrdinal(day)}, $year at $hour12:$minute $period';
+  }
+
+  static String _getOrdinal(int day) {
+    if (day >= 11 && day <= 13) {
+      return '${day}th';
+    }
+    
+    switch (day % 10) {
+      case 1: return '${day}st';
+      case 2: return '${day}nd';
+      case 3: return '${day}rd';
+      default: return '${day}th';
+    }
+  }
+}