一:DateTime.ToString格式化日期
二:代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
...
var startTime ="20170501"
var endTime = "20170430"
var pattern = /(\d{4})(\d{2})(\d{2})/;
var startTime_f = startTime.replace(pattern, '$1-$2-$3')
var endTime_f = endTime.replace(pattern, '$1-$2-...