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code/link56/link56-frontend/src/utils/time.ts

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+import dayjs from 'dayjs'
+
+export function formatPostTime(input?: dayjs.ConfigType): string {
+  if (!input)
+    return ''
+
+  const time = dayjs(input)
+  if (!time.isValid())
+    return ''
+
+  const now = dayjs()
+
+  const diffSeconds = now.diff(time, 'second')
+  if (diffSeconds < 0) {
+    // 未来时间兜底
+    return time.format('YYYY年MM月DD日')
+  }
+
+  // 1 分钟内
+  if (diffSeconds < 60) {
+    return '刚刚'
+  }
+
+  const diffMinutes = now.diff(time, 'minute')
+  if (diffMinutes < 60) {
+    return `${diffMinutes}分钟前`
+  }
+
+  const diffHours = now.diff(time, 'hour')
+  if (diffHours < 24) {
+    return `${diffHours}小时前`
+  }
+
+  const diffDays = now.diff(time, 'day')
+  if (diffDays < 14) {
+    return `${diffDays}天前`
+  }
+
+  // 本年
+  if (time.year() === now.year()) {
+    return time.format('MM月DD日')
+  }
+
+  // 非本年
+  return time.format('YYYY年MM月DD日')
+}
+
+export function formatCommentTime(input?: dayjs.ConfigType): string {
+  if (!input)
+    return ''
+
+  const time = dayjs(input)
+  if (!time.isValid())
+    return ''
+
+  const now = dayjs()
+  const diffSeconds = now.diff(time, 'second')
+
+  // 未来时间兜底
+  if (diffSeconds < 0) {
+    return time.format('YYYY-MM-DD HH:mm')
+  }
+
+  // 1 分钟内
+  if (diffSeconds < 60) {
+    return '刚刚'
+  }
+
+  const diffMinutes = now.diff(time, 'minute')
+  if (diffMinutes < 60) {
+    return `${diffMinutes}分钟前`
+  }
+
+  const diffHours = now.diff(time, 'hour')
+  if (diffHours < 24) {
+    return `${diffHours}小时前`
+  }
+
+  const diffDays = now.diff(time, 'day')
+  if (diffDays < 7) {
+    return `${diffDays}天前`
+  }
+
+  // 本年
+  if (time.year() === now.year()) {
+    return time.format('MM-DD HH:mm')
+  }
+
+  // 非本年
+  return time.format('YYYY-MM-DD HH:mm')
+}
+
+type DateFormat
+  = | 'YYYY'
+    | 'MM'
+    | 'DD'
+    | 'YYYY-MM'
+    | 'YYYY-MM-DD'
+    | 'YYYY-MM-DD HH:mm'
+    | 'YYYY-MM-DD HH:mm:ss'
+    | 'YYYY年MM月DD日'
+
+export function formatDate(
+  input?: dayjs.ConfigType,
+  format: DateFormat = 'YYYY-MM-DD',
+): string {
+  if (!input)
+    return ''
+
+  const date = dayjs(input)
+  if (!date.isValid())
+    return ''
+
+  return date.format(format)
+}
+
+/**
+ * 格式化聊天时间
+ * @param timestamp - 毫秒级时间戳
+ * @param mode - 显示模式：'list' 为列表，'chat' 为聊天记录
+ * @returns 格式化后的时间字符串
+ */
+export function formatImTime(timestamp: number | null | undefined, mode: 'list' | 'chat' = 'list'): string {
+  if (!timestamp)
+    return ''
+
+  const now = new Date()
+  const date = new Date(timestamp)
+
+  const hour = String(date.getHours()).padStart(2, '0')
+  const minute = String(date.getMinutes()).padStart(2, '0')
+  const weekDays = ['周日', '周一', '周二', '周三', '周四', '周五', '周六']
+
+  // 去除时分秒的日期
+  const nowMidnight = new Date(now.getFullYear(), now.getMonth(), now.getDate())
+  const dateMidnight = new Date(date.getFullYear(), date.getMonth(), date.getDate())
+  const diffDays = Math.floor((nowMidnight.getTime() - dateMidnight.getTime()) / (1000 * 3600 * 24))
+
+  // 1️⃣ 当天
+  if (diffDays === 0)
+    return `${hour}:${minute}`
+
+  // 2️⃣ 昨天
+  if (diffDays === 1)
+    return `昨天 ${hour}:${minute}`
+
+  // 3️⃣ 一周内（周一到周日）
+  const weekStart = new Date(nowMidnight.getTime() - ((now.getDay() || 7) - 1) * 24 * 3600 * 1000)
+  if (dateMidnight >= weekStart) {
+    return mode === 'chat'
+      ? `${weekDays[date.getDay()]} ${hour}:${minute}`
+      : weekDays[date.getDay()]
+  }
+
+  // 4️⃣ 本年或跨年（聊天记录模式：统一显示 YYYY/MM/DD HH:mm）
+  const ymd = `${date.getFullYear()}/${String(date.getMonth() + 1).padStart(2, '0')}/${String(date.getDate()).padStart(2, '0')}`
+
+  if (mode === 'chat')
+    return `${ymd} ${hour}:${minute}`
+
+  // 列表模式区分本年/跨年
+  if (date.getFullYear() === now.getFullYear())
+    return `${String(date.getMonth() + 1).padStart(2, '0')}/${String(date.getDate()).padStart(2, '0')}`
+
+  return ymd
+}
+