JS获取系统的指定定年月日

 /**

  * 获取系统当前时间

  */

 function getNowYearMouth(){

      var date=new Date;

      var nowYearMouth=date.getMonth()+1;

      var year=date.getFullYear();

       var day = date.getDate();

      nowYearMouth =(nowYearMouth<10 ? "0"+nowYearMouth:nowYearMouth);    //获取当前时间----月份

      var nowYearMouthCur = (year.toString()+"-"+nowYearMouth.toString());  //获取当前时间----年月

      var beforsixYearMouthday= getBeforeYearMouthDay();

      return  nowYearMouthCur;

 }

 /**

  * 获取系统当前年月日

  */

 function getNowYearMouthDay(){

      var date=new Date;

      var nowYearMouth=date.getMonth()+1;

      var year=date.getFullYear();

       var day = date.getDate();

      nowYearMouth =(nowYearMouth<10 ? "0"+nowYearMouth:nowYearMouth);    //获取当前时间----月份

      day=(day<10?"0"+day:day);

      var nowYearMouthDay = (year.toString()+"-"+nowYearMouth.toString()+"-"+day.toString());//获取系统当前的年月日

      return nowYearMouthDay;

 }

 /**

  * 获取系统前六个月时间--年月

  */

 function getbeforeYearMouth()  {

      var date=new Date;

 //     date = new Date( date - 86400000 * 30 * 10 );

      var month=date.getMonth()+1;

      var year=date.getFullYear();

      for (var i=0;i<6;i++)

      {

          if(month<=0)

          {

              month = month+12;

              year--;

          }

          var tempmonth =(month<10 ? "0"+month:month);

          var mydate = year.toString()+"-"+tempmonth.toString();

          month--;

      }

      return mydate;

 }

 /**

  * 获取系统前六个月的年月日

  */

 function getBeforeYearMouthDay(){

     var tempmonth;

     var date=new Date;

     var month=date.getMonth()+1;

     var year=date.getFullYear();

     var day = date.getDate();

     for (var i=0;i<=12;i++){

         if(month<=0) {

             month = month+12;

             year--;

         }

         tempmonth =(month<10 ? "0"+month:month);

       month--;

     }

     if((year%100!=0)&(year%400==0)&&(year%4==0)){//是闰年的情况下

             if(tempmonth==2){  //若果是2月份

                 if(day>29){

                     tempmonth = tempmonth+1;

                 }else{

                     tempmonth = tempmonth;

                 }

                 }else{//不是2月份的情况

                     tempmonth = tempmonth;

                 }

             }else{//不是闰年的情况下

                 if(tempmonth==2){  //若果是2月份

                     if(day>28){

                         tempmonth = tempmonth+1;

                     }else{

                         tempmonth = tempmonth;

                     }

                 }else{//不是2月份的情况

                         tempmonth = tempmonth;

                     }

             }

     if(day<10){

         day="0"+day;

     }

    var beforeYearMouthDay = year.toString()+"-"+tempmonth.toString()+"-"+day.toString();

    return beforeYearMouthDay;

 }

JS获取系统的指定定年月日的相关教程结束。