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function y2k(number) { return (number < 1000) ? number + 1900 : number; }
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// µ±ÊäÈë²ÎÊýΪisDate(dd,mm,ccyy)ʱ£¬±íʾҪ¼ì²éÄ꣬Ô£¬ÈÕ
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function isDate (day,month,year) {
     var today = new Date();
     year = ((!year) ? y2k(today.getYear())year);
     month = ((!month) ? today.getMonth():month-1);
     if (!day) return false
     var test = new Date(year,month,day);86oo.comÌṩ¸÷Àà½Ì³Ì
     if ( (y2k(test.getYear()) == year) &&
          (month == test.getMonth()) &&
          (day == test.getDate()) )
         return true;
     else
         return false
}
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if (isDate(31,2,1997))
     document.write("Valid");
else
     document.write("Invalid");
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function daysElapsed(date1,date2) {
     var difference = Date.UTC(date1.getYear(),date1.getMonth(),date1.getDate(),0,0,0)
                    - Date.UTC(date2.getYear(),date2.getMonth(),date2.getDate(),0,0,0);
     return difference/1000/60/60/24;86oo.com
}
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<FORM>
<SELECT NAME="selectName">
<OPTION>January
<OPTION>February
<OPTION>March
<OPTION>April
<OPTION>May
<OPTION>June
<OPTION>July
<OPTION>August
<OPTION>Spetember
<OPTION