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