<script language=javascript>
function strDateTime(str){
var reg = /^(d{1,4})(-|/)(d{1,2})2(d{1,2})$/;
var r = str.match(reg);
if(r==null)return false;
var d= new Date(r[1], r[3]-1,r[4]);
var newStr=d.getFullYear()+r[2]+(d.getMonth()+1)+r[2]+d.getDate()
return newStr==str
}
alert(strDateTime("2002-1-31"))
alert(strDateTime("2002-1-41"))
</script>
<script language=javascript>
function strDateTime(str){
var reg = /^(d{1,4})(-|/)(d{1,2})2(d{1,2}) (d{1,2}):(d{1,2}):(d{1,2})$/;
var r = str.match(reg);
if(r==null)return false;
var d= new Date(r[1], r[3]-1,r[4],r[5],r[6],r[7]);
var newStr=d.getFullYear()+r[2]+(d.getMonth()+1)+r[2]+d.getDate()+" "+d.getHours()+":"+d.getMinutes()+":"+d.getSeconds()
return newStr==str
}
alert(strDateTime("2002-1-31 12:34:56"))
alert(strDateTime("2001-2-29 12:54:56"))
alert(strDateTime("2002-1-41 12:00:00"))
</script>

<script language="javascript">
var s="2002-4-16"
alert(chkDate(s));
function chkDate(sDate){
var r=/d{4}(?:-d{1,2}){0,2}/
//正则表达式，判断是否为yyyy-mm-dd,yyyy-mm,yyyy格式
if(sDate.match(r)==sDate){
var arr=sDate.split("-")
switch(arr.length){
//根据不同的yyyy-mm-dd,yyyy-mm格式判断年月日数字是否正确
case 3:
var tmpDate=new Date(arr[0],arr[1],arr[2]);
if(tmpDate.getMonth()==arr[1] && tmpDate.getFullYear()==arr[0]) return true;
break;
case 2:
if(arr[1]<13) return true;
break;
default:
return false;
}
}
return false;
}
</script>

/*
时间有效性判断函数
All by happywinds
*/
function verifyDate(textObj) {
var str=textObj.value;
textObj.value = textObj.value.replace(/s+/g,"");
if(str.search(/^d{4}-d{1,2}-d{1,2}$/) == 0){
var y = parseInt(str.split("-")[0]);
var m = parseInt(str.split("-")[1]);
var d = parseInt(str.split("-")[2]);
switch(m){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
if(d>31){
return false;
textObj.focus();
textObj.select();
}else{
return true;
}
break;
case 2:
if((y%4==0 && d>29) || ((y%4!=0 && d>28))){
return false;
textObj.focus();
textObj.select();
}else{
return true;
}
break;
case 4:
case 6:
case 9:
case 11:
if(d>30){
return false;
textObj.focus();
textObj.select();
}else{
return true;
}
break;
default:
return false;
textObj.focus();
textObj.select();
}
}else{
return false;
textObj.focus();
textObj.select();
}
}