JS获取系统的指定定年月日

 1 /**
 2  * 获取系统当前时间
 3  */
 4 function getNowYearMouth(){
 5      var date=new Date;
 6      var nowYearMouth=date.getMonth()+1;
 7      var year=date.getFullYear(); 
 8       var day = date.getDate(); 
 9      nowYearMouth =(nowYearMouth<10 ? "0"+nowYearMouth:nowYearMouth);    //获取当前时间----月份 
10      var nowYearMouthCur = (year.toString()+"-"+nowYearMouth.toString());  //获取当前时间----年月
11      var beforsixYearMouthday= getBeforeYearMouthDay();
12      return  nowYearMouthCur;
13 }
14 
15 /**
16  * 获取系统当前年月日
17  */
18 function getNowYearMouthDay(){
19      var date=new Date;
20      var nowYearMouth=date.getMonth()+1;
21      var year=date.getFullYear(); 
22       var day = date.getDate(); 
23      nowYearMouth =(nowYearMouth<10 ? "0"+nowYearMouth:nowYearMouth);    //获取当前时间----月份 
24      day=(day<10?"0"+day:day);
25      var nowYearMouthDay = (year.toString()+"-"+nowYearMouth.toString()+"-"+day.toString());//获取系统当前的年月日
26      return nowYearMouthDay;
27 }
28 
29 
30 
31 /**
32  * 获取系统前六个月时间--年月
33  */
34 function getbeforeYearMouth()  { 
35      var date=new Date;  
36 //     date = new Date( date - 86400000 * 30 * 10 );
37      var month=date.getMonth()+1; 
38      var year=date.getFullYear();
39      for (var i=0;i<6;i++)
40      {
41          if(month<=0)
42          {
43              month = month+12;
44              year--;
45          }
46          var tempmonth =(month<10 ? "0"+month:month); 
47          var mydate = year.toString()+"-"+tempmonth.toString();  
48          month--;
49      }
50      return mydate;
51 }   
52 /**
53  * 获取系统前六个月的年月日
54  */
55 function getBeforeYearMouthDay(){
56     var tempmonth;
57     var date=new Date;  
58     var month=date.getMonth()+1; 
59     var year=date.getFullYear();
60     var day = date.getDate(); 
61     for (var i=0;i<=12;i++){
62         if(month<=0) {
63             month = month+12;
64             year--;
65         }
66         tempmonth =(month<10 ? "0"+month:month); 
67       month--;
68     }
69     if((year%100!=0)&(year%400==0)&&(year%4==0)){//是闰年的情况下
70             if(tempmonth==2){  //若果是2月份
71                 if(day>29){
72                     tempmonth = tempmonth+1;
73                 }else{
74                     tempmonth = tempmonth;
75                 }
76                 }else{//不是2月份的情况
77                     tempmonth = tempmonth;
78                 }
79             }else{//不是闰年的情况下
80                 if(tempmonth==2){  //若果是2月份
81                     if(day>28){
82                         tempmonth = tempmonth+1;
83                     }else{
84                         tempmonth = tempmonth;
85                     }
86                 }else{//不是2月份的情况
87                         tempmonth = tempmonth;
88                     }
89             }
90     if(day<10){
91         day="0"+day;
92     }
93    var beforeYearMouthDay = year.toString()+"-"+tempmonth.toString()+"-"+day.toString();    
94    return beforeYearMouthDay;
95 }