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miniprogram/utils/format.ts

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+// 金额 / 时间格式化工具
+
+function pad(n: number): string {
+  return n < 10 ? `0${n}` : `${n}`
+}
+
+// 金额（分）转「¥xx.xx」字符串
+export function fenToYuan(fen: number | null | undefined): string {
+  if (fen === null || fen === undefined || isNaN(fen)) return '¥0.00'
+  return `¥${(fen / 100).toFixed(2)}`
+}
+
+// 秒级时间戳转 YYYY-MM-DD
+export function formatDate(seconds: number | null | undefined): string {
+  if (!seconds) return ''
+  const d = new Date(seconds * 1000)
+  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}`
+}
+
+// 秒级时间戳转 YYYY-MM-DD HH:mm
+export function formatDateTime(seconds: number | null | undefined): string {
+  if (!seconds) return ''
+  const d = new Date(seconds * 1000)
+  return `${formatDate(seconds)} ${pad(d.getHours())}:${pad(d.getMinutes())}`
+}
+
+// 相对时间：刚刚 / x分钟前 / x小时前 / 今天 / YYYY-MM-DD
+export function formatRelativeTime(seconds: number | null | undefined): string {
+  if (!seconds) return ''
+  const now = Math.floor(Date.now() / 1000)
+  const diff = now - seconds
+  if (diff < 0) return formatDate(seconds)
+  if (diff < 60) return '刚刚'
+  if (diff < 3600) return `${Math.floor(diff / 60)} 分钟前`
+
+  const d = new Date(seconds * 1000)
+  const today = new Date()
+  const isToday =
+    d.getFullYear() === today.getFullYear() &&
+    d.getMonth() === today.getMonth() &&
+    d.getDate() === today.getDate()
+
+  if (diff < 86400) {
+    return isToday ? '今天' : `${Math.floor(diff / 3600)} 小时前`
+  }
+  return formatDate(seconds)
+}
+
+// 支付倒计时（秒）转 mm:ss
+export function formatCountdown(totalSeconds: number): string {
+  if (totalSeconds <= 0) return '00:00'
+  const m = Math.floor(totalSeconds / 60)
+  const s = Math.floor(totalSeconds % 60)
+  return `${pad(m)}:${pad(s)}`
+}