javascript 日期函数操作

  1 <mce:script type="text/javascript">
  2 <!--
  3     //当天
  4      function showToDay()
  5     {
  6         var Nowdate=new Date();
  7         M=Number(Nowdate.getMonth())+1
  8         return Nowdate.getYear()+"-"+M+"-"+Nowdate.getDate();
  9     }    
 10  
 11     
 12     //本周第一天
 13      function showWeekFirstDay() 
 14 
 15     {
 16         var Nowdate=new Date();
 17         var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
 18         return WeekFirstDay;
 19     } 
 20     //本周最后一天
 21      function showWeekLastDay()
 22     {
 23         var Nowdate=new Date();
 24         var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
 25         var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);
 26         return WeekLastDay;
 27     } 
 28     //本月第一天
 29      function showMonthFirstDay()
 30     {
 31         var Nowdate=new Date();
 32         var MonthFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth(),1);
 33         return MonthFirstDay;
 34     }
 35  
 36     //本月最后一天 
 37 
 38      function showMonthLastDay()
 39     {
 40         var Nowdate=new Date();
 41         var tmpDate=new Date(Nowdate.getYear(),Nowdate.getMonth()+1,1);
 42         //tmpDate.setDate(tmpDate.getDate() -1);
 43         //return new Date(Nowdate.getYear(),Nowdate.getMonth(),tmpDate.getDate()); 
 44         var MonthLastDay=new Date(tmpDate-86400000);
 45         return MonthLastDay; 
 46 
 47     }
 48 
 49     
 50     //本季第一天
 51      function showquarterFirstDay()
 52     {
 53         var Nowdate=new Date();
 54         if(Nowdate.getMonth()<3) 
 55            return new Date(Nowdate.getYear(),0,1);
 56         else if(Nowdate.getMonth()>2 && Nowdate.getMonth()<6) 
 57            return new Date(Nowdate.getYear(),3,1); 
 58         else if(Nowdate.getMonth()>5 && Nowdate.getMonth()<9) 
 59            return new Date(Nowdate.getYear(),6,1);
 60         else if(Nowdate.getMonth()>8) 
 61            return new Date(Nowdate.getYear(),9,1);
 62     }
 63  
 64     //本季最后一天
 65      function showquarterLastDay()
 66     {
 67         var Nowdate=new Date(); 
 68 
 69         if(Nowdate.getMonth()<3) 
 70            return new Date(Nowdate.getYear(),2,31);
 71         else if(Nowdate.getMonth()>2 && Nowdate.getMonth()<6) 
 72            return new Date(Nowdate.getYear(),5,30);
 73         else if(Nowdate.getMonth()>5 && Nowdate.getMonth()<9) 
 74            return new Date(Nowdate.getYear(),8,30);
 75         else if(Nowdate.getMonth()>8) 
 76            return new Date(Nowdate.getYear(),11,31);
 77     }
 78  
 79     
 80     //本年第一天
 81      function showyearFirstDay()
 82     {
 83         var Nowdate=new Date();
 84         var yearFirstDay=new Date(Nowdate.getYear(),0,1);
 85         return yearFirstDay;
 86     }
 87  
 88     //本年最后一天
 89      function showyearLastDay()
 90     {
 91         var Nowdate=new Date();
 92         var yearLastDay=new Date(Nowdate.getYear(),11,31);
 93         return yearLastDay;
 94     }
 95  
 96     
 97     //当前月
 98      function showmonthCurrent()
 99     {
100         var Nowdate=new Date();
101         var Month=Nowdate.getMonth()+1;
102         Month=(Month<10)?'-0'+Month:'-'+Month;
103         return Nowdate.getYear()+Month;
104     } 
105     
106     //本季开始年月
107      function showquarterFirstMonth()
108     {
109         var Nowdate=new Date();
110         if(Nowdate.getMonth()<3)
111             return Nowdate.getYear()+'-01';
112         else if(Nowdate.getMonth()>2 && Nowdate.getMonth()<6)
113             return Nowdate.getYear()+'-04'; 
114         else if(Nowdate.getMonth()>5 && Nowdate.getMonth()<9)
115             return Nowdate.getYear()+'-07';
116         else if(Nowdate.getMonth()>8)
117             return Nowdate.getYear()+'-10';
118     }
119  
120     //本季最后年月
121      function showquarterLastMonth()
122     {
123         var Nowdate=new Date(); 
124         if(Nowdate.getMonth()<3)
125             return Nowdate.getYear()+'-03';
126         else if(Nowdate.getMonth()>2 && Nowdate.getMonth()<6)
127             return Nowdate.getYear()+'-06';
128         else if(Nowdate.getMonth()>5 && Nowdate.getMonth()<9)
129             return Nowdate.getYear()+'-09';
130         else if(Nowdate.getMonth()>8)
131             return Nowdate.getYear()+'-12';
132     }
133  
134     
135     //本年开始年月
136      function showyearFirstMonth() 
137     {
138         var Nowdate=new Date();
139         return Nowdate.getYear()+'-01';
140     }
141  
142     //本年最后年月
143      function showyearLastMonth()
144     {
145         var Nowdate=new Date();
146         return Nowdate.getYear()+'-12';
147     }
148     //格式化日期格式
149      function Date.prototype.toString(){
150     return this.getFullYear()+"-"+(this.getMonth()+1)+"-"+this.getDate();
151     } 
152 // -->
153 </mce:script>

转自http://blog.csdn.net/cntmi/article/details/4742021