diff --git a/lib/transfer.ts b/lib/transfer.ts
index 54abf52..5bb8164 100644
--- a/lib/transfer.ts
+++ b/lib/transfer.ts
@@ -1,3 +1,37 @@
+const dateFormat: (date: Date, fmt: string) => string = (date, fmt) => {
+  const o = {
+    'M+': date.getMonth() + 1, // 月份
+    'd+': date.getDate(), // 日
+    'h+': date.getHours(), // 小时
+    'm+': date.getMinutes(), // 分
+    's+': date.getSeconds(), // 秒
+    'q+': Math.floor((date.getMonth() + 3) / 3), // 季度
+    S: date.getMilliseconds() // 毫秒
+  }
+  let format = fmt
+  if (/(y+)/.test(fmt)) {
+    format = fmt.replace(
+      RegExp.$1,
+      String(date.getFullYear()).substr(4 - RegExp.$1.length)
+    )
+  }
+  if (/(wk)/.test(fmt)) {
+    const wks = '日一二三四五六'.split('')
+    format = fmt.replace(RegExp.$1, wks[date.getDay()])
+  }
+  for (const k in o) {
+    if (new RegExp(`(${k})`).test(format)) {
+      format = format.replace(
+        RegExp.$1,
+        RegExp.$1.length === 1
+          ? (o as any)[k]
+          : `00${(o as any)[k]}`.substr(String((o as any)[k]).length)
+      )
+    }
+  }
+  return format
+}
+
 // 时间差，单位为小时
 const offsetHours = (date1: Date, date2: Date): number => {
   const NUM = 3600000
@@ -33,4 +67,4 @@ const stringToDate = (val: string): Date => {
   return new Date()
 }
 
-export { offsetHours, offsetDays, stringToDate }
+export { offsetHours, offsetDays, stringToDate, dateFormat }