如何验证输入的日期合法？

Question

http://expert.csdn.net/Expert/FAQ/FAQ_Index.asp?id=1568

Answer 1

/**
 *purpose      : 是否是正确的日期格式
 *parameters   : value:  String             
 *return value : boolean
*/function validateDate(value) {
         var bValid = true;
         var i = 0;
         var datePattern = "yyyy-MM-dd";
         var MONTH = "MM";
         var DAY = "dd";
         var YEAR = "yyyy";
         var orderMonth = datePattern.indexOf(MONTH);
         var orderDay = datePattern.indexOf(DAY);
         var orderYear = datePattern.indexOf(YEAR);
         if ((orderDay < orderYear && orderDay > orderMonth)) {
             var iDelim1 = orderMonth + MONTH.length;
             var iDelim2 = orderDay + DAY.length;
             var delim1 = datePattern.substring(iDelim1, iDelim1 + 1);
             var delim2 = datePattern.substring(iDelim2, iDelim2 + 1);
             if (iDelim1 == orderDay && iDelim2 == orderYear) {
                dateRegexp = new RegExp("^(\\d{2})(\\d{2})(\\d{4})$");
             } else if (iDelim1 == orderDay) {
                dateRegexp = new RegExp("^(\\d{2})(\\d{2})[" + delim2 + "](\\d{4})$");
             } else if (iDelim2 == orderYear) {
                dateRegexp = new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})(\\d{4})$");
             } else {
                dateRegexp = new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})[" + delim2 + "](\\d{4})$");
             }
             var matched = dateRegexp.exec(value);
             if(matched != null) {
                if (!isValidDate(matched[2], matched[1], matched[3])) {
                   bValid =  false;
                }
             } else {
                bValid =  false;
             }
         } else if ((orderMonth < orderYear && orderMonth > orderDay)) {
             var iDelim1 = orderDay + DAY.length;
             var iDelim2 = orderMonth + MONTH.length;
             var delim1 = datePattern.substring(iDelim1, iDelim1 + 1);
             var delim2 = datePattern.substring(iDelim2, iDelim2 + 1);
             if (iDelim1 == orderMonth && iDelim2 == orderYear) {
                 dateRegexp = new RegExp("^(\\d{2})(\\d{2})(\\d{4})$");
             } else if (iDelim1 == orderMonth) {
                 dateRegexp = new RegExp("^(\\d{2})(\\d{2})[" + delim2 + "](\\d{4})$");
             } else if (iDelim2 == orderYear) {
                 dateRegexp = new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})(\\d{4})$");
             } else {
                 dateRegexp = new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})[" + delim2 + "](\\d{4})$");
             }
             var matched = dateRegexp.exec(value);
             if(matched != null) {
                 if (!isValidDate(matched[1], matched[2], matched[3])) {
                     bValid =  false;
                  }
             } else {
                 bValid =  false;
             }
         } else if ((orderMonth > orderYear && orderMonth < orderDay)) {
             var iDelim1 = orderYear + YEAR.length;
             var iDelim2 = orderMonth + MONTH.length;
             var delim1 = datePattern.substring(iDelim1, iDelim1 + 1);
             var delim2 = datePattern.substring(iDelim2, iDelim2 + 1);
             if (iDelim1 == orderMonth && iDelim2 == orderDay) {
                 dateRegexp = new RegExp("^(\\d{4})(\\d{2})(\\d{2})$");
             } else if (iDelim1 == orderMonth) {
                 dateRegexp = new RegExp("^(\\d{4})(\\d{2})[" + delim2 + "](\\d{2})$");
             } else if (iDelim2 == orderDay) {
                 dateRegexp = new RegExp("^(\\d{4})[" + delim1 + "](\\d{2})(\\d{2})$");
             } else {
                 dateRegexp = new RegExp("^(\\d{4})[" + delim1 + "](\\d{2})[" + delim2 + "](\\d{2})$");
             }
             var matched = dateRegexp.exec(value);
             if(matched != null) {
                 if (!isValidDate(matched[3], matched[2], matched[1])) {
                      bValid =  false;
                  }
              } else {
                  bValid =  false;
              }
         } else {
             bValid =  false;
         }
   return bValid;
}function isValidDate(day, month, year) {
        if (month < 1 || month > 12) {
        return false;
    }
    if (day < 1 || day > 31) {
        return false;
    }
    if ((month == 4 || month == 6 || month == 9 || month == 11) &&
        (day == 31)) {
        return false;
    }
    if (month == 2) {
        var leap = (year % 4 == 0 &&
                   (year % 100 != 0 || year % 400 == 0));
        if (day>29 || (day == 29 && !leap)) {
            return false;
        }
    }
    return true;
}

Answer 2

用vbscript的isdate函数最方便，而且考虑到了所有方面(各种格式，各种情况)，功能强大。javascript调用vbscript函数如下：<script language="VBScript">
function isdat(x) //判断是否为日期
isdat=isdate(x)
end function
</script><script language="javascript">
 alert(isdat("2002-02-31"));
</script>

Answer 3

//函数名：CheckDateTime  
//功能介绍：检查是否为日期时间 
function CheckDateTime(str){  
    var reg = /^(\d+)-(\d{1,2})-(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/; 
    var r = str.match(reg); 
    if(r==null)return false; 
    r[2]=r[2]-1; 
    var d= new Date(r[1], r[2],r[3], r[4],r[5], r[6]); 
    if(d.getFullYear()!=r[1])return false; 
    if(d.getMonth()!=r[2])return false; 
    if(d.getDate()!=r[3])return false; 
    if(d.getHours()!=r[4])return false; 
    if(d.getMinutes()!=r[5])return false; 
    if(d.getSeconds()!=r[6])return false; 
    return true;
}

Answer 4

http://jkisjk.vip.sina.com/code/html/inputcheck.htm内容有：
1.数值与整数的输入验证与自动纠错，以及输入范围的控制
2.日期的输入验证与自动纠错，以及日期弹出框
3.编号的输入验证与自动纠错
4.必须输入字段的验证(在提交时验证，使用时不需要另写JS程序)