diff --git a/utils/index.js b/utils/index.js
index b6fa932..4f56034 100644
--- a/utils/index.js
+++ b/utils/index.js
@@ -1,12 +1,15 @@
 import env from '@/env/index.js'
 import store from '@/store/index.js'
-import { isDate } from './is.js'
+import { isDate, isString } from './is.js'
 /**
  * 日期格式化，样例 yyyy-mm-dd hh:MM:ss
  * @param date Date 需要转换的日期
  * @param fmt string 转化的格式 yyyy-mm-dd hh:MM:ss
  */
 export const dateTimeFormat = (date, fmt) => {
+  if (isString(date)) {
+    date = date.replace(/-/g, '/')
+  }
   if (!isDate(date)) {
     date = new Date(date)
   }
@@ -127,9 +130,15 @@ export function round(number, precision) {
  * @returns 时间差对象
  */
 export const difTime = (time, target) => {
+  if (isString(time)) {
+    time = time.replace(/-/g, '/')
+  }
+  if (isString(target)) {
+    target = target.replace(/-/g, '/')
+  }
   let begin = new Date(time).getTime()
   // 兼容ios时间
-  let end = new Date(target.replace(/-/g, '/')).getTime()
+  let end = new Date(target).getTime()
   let beyond = begin < end ? false : true
   let diff = Math.abs(begin - end)
   // 计算天数
diff --git a/utils/is.js b/utils/is.js
index ac04e98..9ff756c 100644
--- a/utils/is.js
+++ b/utils/is.js
@@ -19,3 +19,7 @@ export function isArray(val) {
 export function isDate(val) {
   return is(val, 'Date')
 }
+
+export function isString(val) {
+  return is(val, 'String')
+}