<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();
}
}