Date.prototype.format = function(format) { var o = {  "M+" : this.getMonth() + 1, // month  "d+" : this.getDate(), // day  "h+" : this.getHours(), // hour  "m+" : this.getMinutes(), // minute  "s+" : this.getSeconds(), // second  "q+" : Math.floor((this.getMonth() + 3) / 3), // quarter  "S" : this.getMilliseconds() // millisecond } if (/(y+)/.test(format))  format = format.replace(RegExp.$1, (this.getFullYear() + "")    .substr(4 - RegExp.$1.length)); for ( var k in o)  if (new RegExp("(" + k + ")").test(format))   format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k]     : ("00" + o[k]).substr(("" + o[k]).length)); return format;}var begin=new Date();var end=new Date();new Date(begin.setMonth((new Date().getMonth()-1)));var begintime= begin.Format("yyyy-MM-dd");var endtime=end.Format("yyyy-MM-dd");$('#txtBeginVisitTime').val(begintime);$('#txtEndVisitTime').val(endtime);