js如何获取上个月第一天和最后一天

JQ如何获取上个月第一天和最后一天日期？
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var nowdays = new Date();

var year = nowdays.getFullYear();

var month = nowdays.getMonth();

if(month==0){

   month = 12;

   year = year-1;

}

if(month<10){

   month = '0'+month;

}

var myDate = new Date(year,month,0);

var startDate = year+'-'+month+'-01 00:00:00'; //上个月第一天

var endDate = year+'-'+month+'-'+myDate.getDate()+' 23:59:00';//上个月最后一天