如何验证客户端.net C＃中的日期格式？

    <asp:CompareValidator ID=\"CompareValidator1\" runat=\"server\" 
           ControlToValidate=\"DateTextBox\" ErrorMessage=\"Enter a valid date\"
           Operator=\"DataTypeCheck\" Type=\"Date\" ValidationGroup=\"GroupName\" />

    <%@ Register Assembly=\"AjaxControlToolkit\" Namespace=\"AjaxControlToolkit\" 
                     TagPrefix=\"ajaxToolkit\" %>

<asp:ScriptManager ID=\"ScriptManager1\" runat=\"server\"></asp:ScriptManager>
        <asp:Label ID=\"lblDate\" runat=\"server\" Text=\"Date: \"></asp:Label>
        <asp:TextBox ID=\"txtDate\" runat=\"server\" Width=\"140px\"></asp:TextBox>
        <asp:Image ID=\"imgCalendar\" runat=\"server\" ImageUrl=\"~/Images/Calendar.png\" />
        <ajaxToolkit:CalendarExtender ID=\"CalendarExtender1\" runat=\"server\" 
               TargetControlID=\"txtDate\" Format=\"MM/dd/yyyy\" 
               PopupButtonID=\"imgCalendar\" />
        <asp:CompareValidator ID=\"CompareValidator1\" runat=\"server\" 
               ControlToValidate=\"txtDate\" ErrorMessage=\"* Enter a valid date\"
               Operator=\"DataTypeCheck\" Type=\"Date\" ValidationGroup=\"grpDate\" />

$.validator.addMethod(
\"australianDate\",
function(value, element) {
    // put your own logic here, this is just a (crappy) example
    return value.match(/^\\d\\d?\\/\\d\\d?\\/\\d\\d\\d\\d$/);
},
\"Please enter a date in the format dd/mm/yyyy\"
);

$(\'#myForm\')
.validate({
    rules :
        myDate : {
            australianDate : true
        }
})
;

<script language = \"Javascript\">

// Declaring valid date character, minimum year and maximum year
var dtCh= \"/\";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
    var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < \"0\") || (c > \"9\"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
    var i;
    var returnString = \"\";
    // Search through string\'s characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
    // February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
    for (var i = 1; i <= n; i++) {
        this[i] = 31
        if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
        if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
    var daysInMonth = DaysArray(12)
    var pos1=dtStr.indexOf(dtCh)
    var pos2=dtStr.indexOf(dtCh,pos1+1)
    var strDay=dtStr.substring(0,pos1)
    var strMonth=dtStr.substring(pos1+1,pos2)
    var strYear=dtStr.substring(pos2+1)
    strYr=strYear
    if (strDay.charAt(0)==\"0\" && strDay.length>1) strDay=strDay.substring(1)
    if (strMonth.charAt(0)==\"0\" && strMonth.length>1) strMonth=strMonth.substring(1)
    for (var i = 1; i <= 3; i++) {
        if (strYr.charAt(0)==\"0\" && strYr.length>1) strYr=strYr.substring(1)
    }
    month=parseInt(strMonth)
    day=parseInt(strDay)
    year=parseInt(strYr)
    if (pos1==-1 || pos2==-1){
        alert(\"The date format should be : dd/mm/yyyy\")
        return false
    }
    if (strMonth.length<1 || month<1 || month>12){
        alert(\"Please enter a valid month\")
        return false
    }
    if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
        alert(\"Please enter a valid day\")
        return false
    }
    if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
        alert(\"Please enter a valid 4 digit year between \"+minYear+\" and \"+maxYear)
        return false
    }
    if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
        alert(\"Please enter a valid date\")
        return false
    }
return true
}

function ValidateForm(){
    var dt=document.frmSample.txtDate
    if (isDate(dt.value)==false){
        dt.focus()
        return false
    }
    return true
 }

</script>`