<script language=javascript>
function isDate(str)
{
var r = str.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);
if(r==null)return false; var d = new Date(r[1], r[3]-1, r[4]);
return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]);
}
alert(isDate("2002/1/31"));
alert(isDate("2002-01-41"));
</script>
function isDate(str)
{
var r = str.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);
if(r==null)return false; var d = new Date(r[1], r[3]-1, r[4]);
return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]);
}
alert(isDate("2002/1/31"));
alert(isDate("2002-01-41"));
</script>
function check(form){
if (document.form1.textfield.value==""){
alert('日期不能为空!');
return false;
}
var date;
date=document.form1.textfield.value;
if (date.substring(4,5)!="/" || (date.substring(7,8)!="/" && date.substring(6,7)!="/")){
alert("你输入的日期格式不对!格式应为:年/月/日");
return false;
}
if (date.length==10)
{ if (date.substring(5,6)>"12" || date.substring(8,9)>"31")
{alert("你输入的日期不正确!");
return false;
}
}
if (date.length>10)
{
alert("你输入的日期不正确!");
return false;
}
if (date.length<8)
{
alert("你输入的日期不正确!");
return false;
}
if (date.length==9)
{ if (date.substring(7,8)=="/" )
{
if (date.substring(5,7)>"12")
{ alert("你输入的日期不正确!");
return false;
}
}
if (date.substring(6,7)=="/" )
{ if (date.substring(7,9)>"31")
{ alert("你输入的日期不正确!");
return false;
}
}
}
return true;
}
</script>