ÿþ//åegWšI‹

function chkDate(datestr) { 

    var year, month, day; 

    var pattern = /^\d{4}\/\d{1,2}\/\d{1,2}$/; 

    var tmpary  = new Array() 

    if (!pattern.test(datestr))  return false; 



    tmpary = datestr.split("/"); 

    year  = tmpary[0]; 

    month = tmpary[1]; 

    day   = tmpary[2]; 



    if (month<1 || month>12 || day>31 || day<1)  return false; 



    if (month == 2 && day > 28) { 

        if ((year%4==0 && year%100!=0) || (year%400==0)) { // ¬°¶|¦~ 

            if (day > 29) return false; 

        } 

        else {  // «D¶|¦~ 

            return false; 

        } 

    } 

    if (day>30 && ((month % 2) == Math.floor(month/8))) return false; 



    return true; 

}