[原创]判断一个字符串是否为合法日期

//日期格式：YYYY-MM-DD
function isdate(strDate){
var strSeparator = "-"; //日期分隔符
var strDateArray;
var intYear;
var intMonth;
var intDay;
var boolLeapYear;

strDateArray = strDate.split(strSeparator);

if(strDateArray.length!=3) return false;

intYear = parseInt(strDateArray[0],10);
intMonth = parseInt(strDateArray[1],10);
intDay = parseInt(strDateArray[2],10);

if(isNaN(intYear)||isNaN(intMonth)||isNaN(intDay)) return false;

if(intMonth>12||intMonth<1) return false;

if((intMonth==1||intMonth==3||intMonth==5||intMonth==7||intMonth==8||intMonth==10||intMonth==12)&&(intDay>31||intDay<1)) return false;

if((intMonth==4||intMonth==6||intMonth==9||intMonth==11)&&(intDay>30||intDay<1)) return false;

if(intMonth==2){
if(intDay<1) return false;

boolLeapYear = false;
if((intYear%100)==0){
if((intYear%400)==0) boolLeapYear = true;
}
else{
if((intYear%4)==0) boolLeapYear = true;
}

if(boolLeapYear){
if(intDay>29) return false;
}
else{
if(intDay>28) return false;
}
}

return true;
}
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