获取当前系统时间和上一个月时间，格式为yyyy-MM-dd

var mydateInputbeginDate = document.getElementById("beginDate");
        var datebeginDate = new Date();
        datebeginDate.setMonth(datebeginDate.getMonth()-1);

        //下面语句判断，当月份小于10月时，前面位0
        var YbeginDate = datebeginDate.getFullYear();
        var MbeginDate = datebeginDate.getMonth() + 1;

        if( MbeginDate < 10){
            MbeginDate = '0' + MbeginDate;
            }
        var DbeginDate = datebeginDate.getDate();
        if( DbeginDate < 10){
            DbeginDate = '0' + DbeginDate;
            }
        var dateStringbeginDate = YbeginDate + "-" + MbeginDate + "-" + DbeginDate;
        mydateInputbeginDate.value = dateStringbeginDate;



        var mydateInput = document.getElementById("endDate");
        var date = new Date();

        //下面语句判断，当月份小于10月时，前面位0
        var Y = date.getFullYear();
        var M = date.getMonth() + 1;

        if( M < 10){
            M = '0' + M;
            }
        var D = date.getDate();
        if( D < 10){
            D = '0' + D;
            }
        var dateString = Y + "-" + M + "-" + D;
        mydateInput.value = dateString;

参考

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
       
    </head>
 
    <body>
        <input type="text" class="form-control input-medium" placeholder="开始时间" name="" id="startTime" />
        <input type="text" class="form-control input-medium" placeholder="结束时间" name="" id="endTime" />
 
    </body>
    <script type="text/javascript">
      
   var mydateInputbeginDate = document.getElementById("startTime");
         var datebeginDate = new Date();
         datebeginDate.setMonth(datebeginDate.getMonth()-1);
 
         //下面语句判断，当月份小于10月时，前面位0
         var YbeginDate = datebeginDate.getFullYear();
         var MbeginDate = datebeginDate.getMonth() + 1;
 
         if( MbeginDate < 10){
             MbeginDate = '0' + MbeginDate;
             }
         var DbeginDate = datebeginDate.getDate();
         if( DbeginDate < 10){
             DbeginDate = '0' + DbeginDate;
             }
         var dateStringbeginDate = YbeginDate + "-" + MbeginDate + "-" + DbeginDate;
         mydateInputbeginDate.value = dateStringbeginDate;
 
 
 
         var mydateInput = document.getElementById("endTime");
         var date = new Date();
 
         //下面语句判断，当月份小于10月时，前面位0
         var Y = date.getFullYear();
         var M = date.getMonth() + 1;
 
         if( M < 10){
             M = '0' + M;
             }
         var D = date.getDate();
         if( D < 10){
             D = '0' + D;
             }
         var dateString = Y + "-" + M + "-" + D;
         mydateInput.value = dateString;
    </script>
 
</html>

获取当前系统时间和上一个月时间，格式为yyyy-MM-dd

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