PS:getYear()有Y2K問題所以建議全部轉用getFullYear();
PS:DATE對象GETYEAR(）方法和GETFULLYEAR()方法區別
getYear()
使用getYear()函數的本意是獲取年份，以2010年為例，如：
Js代碼
var nowd = new Date();
var yf = nowd.getYear();
在IE中是可以正確獲取年份：2010，但是在FF等瀏覽器下則為：110。
原因則是在FF等瀏覽器內getYear 返回的是"當前年份-1900" 的值（即年份基數是1900）
而IE則是當today的年份大於等於2000的時，直接將1900加上了，返回的2010。
getFullYear()
使用getFullYear()在IE和FF中都可以正確獲取年份：2010
注意
使用js來獲取年份都使用：getFullYear()
<script language=javascript>
//算出今天和上一個月
function LastMonth(){
var nowdate = new Date();
var lastdate = new Date();
nowdate.setMonth(nowdate.getMonth()+1);//算當月要加1
lastdate.setMonth(nowdate.getMonth()-1);
nowdate = nowdate.getFullYear()+"-"+nowdate.getMonth()+"-"+nowdate.getDate();
lastdate = lastdate.getFullYear()+"-"+lastdate.getMonth()+"-"+lastdate.getDate();
date_html = lastdate + ' ~ ' + nowdate ;
}
//----------------以下方式為舊的方式參考就好---------------------------------------------
//今天
function showToDay()
{
var Nowdate=new Date();
M=Number(Nowdate.getMonth())+1
return Nowdate.getFullYear()+"-"+M+"-"+Nowdate.getDate();
}
//本周第一天
function showWeekFirstDay()
{
var Nowdate=new Date();
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
return WeekFirstDay;
}
//本周最后一天
function showWeekLastDay()
{
var Nowdate=new Date();
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);
return WeekLastDay;
}
//本月第一天
function showMonthFirstDay()
{
var Nowdate=new Date();
var MonthFirstDay=new Date(Nowdate.getFullYear(),Nowdate.getMonth(),1);
return MonthFirstDay;
}
//本月最後一天
function showMonthLastDay()
{
var Nowdate=new Date();
var MonthNextFirstDay=new Date(Nowdate.getFullYear(),Nowdate.getMonth()+1,1);
var MonthLastDay=new Date(MonthNextFirstDay-86400000);
return MonthLastDay;
}
//上月第一天
function showPreviousFirstDay()
{
var MonthFirstDay=showMonthFirstDay()
return new Date(MonthFirstDay.getFullYear(),MonthFirstDay.getMonth()-1,1)
}
//上月最後一天
function showPreviousLastDay()
{
var MonthFirstDay=showMonthFirstDay();
return new Date(MonthFirstDay-86400000);
}
//上周第一天
function showPreviousFirstWeekDay()
{
var WeekFirstDay=showWeekFirstDay()
return new Date(WeekFirstDay-86400000*7)
}
//上周最後一天
function showPreviousLastWeekDay()
{
var WeekFirstDay=showWeekFirstDay()
return new Date(WeekFirstDay-86400000)
}
//上一天
function showPreviousDay()
{
var MonthFirstDay=new Date();
return new Date(MonthFirstDay-86400000);
}
//下一天
function showNextDay()
{
var MonthFirstDay=new Date();
return new Date((MonthFirstDay/1000+86400)*1000);
}
//下周第一天
function showNextFirstWeekDay()
{
var MonthFirstDay=showWeekLastDay()
return new Date((MonthFirstDay/1000+86400)*1000)
}
//下周最後一天
function showNextLastWeekDay()
{
var MonthFirstDay=showWeekLastDay()
return new Date((MonthFirstDay/1000+7*86400)*1000)
}
//下月第一天
function showNextFirstDay()
{
var MonthFirstDay=showMonthFirstDay()
return new Date(MonthFirstDay.getFullYear(),MonthFirstDay.getMonth()+1,1)
}
//下月最後一天
function showNextLastDay()
{
var MonthFirstDay=showMonthFirstDay()
return new Date(new Date(MonthFirstDay.getFullYear(),MonthFirstDay.getMonth()+2,1)-86400000)
}
function Date.prototype.toString(){
return this.getFullYear()+"-"+(this.getMonth()+1)+"-"+this.getDate();
}
function setDate(num){
if(num==1){
document.all.dateDate.value=showMonthFirstDay();
document.all.dateDate2.value=showMonthLastDay();
}
if(num==2){
document.all.dateDate.value=showWeekFirstDay();
document.all.dateDate2.value=showWeekLastDay();
}
if(num==3){
document.all.dateDate.value=showToDay();
document.all.dateDate2.value=showToDay();
}
if(num==4){
document.all.dateDate.value=showPreviousFirstDay();
document.all.dateDate2.value=showPreviousLastDay();
}
if(num==5){
document.all.dateDate.value=showNextFirstDay();
document.all.dateDate2.value=showNextLastDay();
}
if(num==6){
document.all.dateDate.value=showPreviousFirstWeekDay();
document.all.dateDate2.value=showPreviousLastWeekDay();
}
if(num==7){
document.all.dateDate.value=showNextFirstWeekDay();
document.all.dateDate2.value=showNextLastWeekDay();
}
if(num==8){
document.all.dateDate.value=showPreviousDay();
document.all.dateDate2.value=showPreviousDay();
}
if(num==9){
document.all.dateDate.value=showNextDay();
document.all.dateDate2.value=showNextDay();
}
}
</script>
<input name=dateDate type=text>-><input name=dateDate2 type=text>
<input name=haha type=button value="上一月" onclick=setDate(4)>
<input name=haha type=button value="本月" onclick=setDate(1)>
<input name=haha type=button value="下一月" onclick=setDate(5)>
<input name=haha type=button value="上一周" onclick=setDate(6)>
<input name=haha type=button value="本周" onclick=setDate(2)>
<input name=haha type=button value="下一周" onclick=setDate(7)>
<input name=haha type=button value="上一天" onclick=setDate(8)>
<input name=haha type=button value="今天" onclick=setDate(3)>
<input name=haha type=button value="下一天" onclick=setDate(9)>
