日期，日期时间类型数据格式校验

<script>

function testDatatime(){

alert(!"2010-01-29 12:44:12.1022".isDateTime());
     alert("2010-01-29 12:44:12.122".isDateTime());
     alert(!"2010-01-29 24:44:12".isDateTime());
     alert("2010-3-31 12:44:12".isDateTime());
     alert(!"1900-2-29 12:44:12".isDateTime());
     alert(!"1900-4-31 12:44:12".isDateTime());
     alert("1904-2-29 12:44:12".isDateTime());
}
function testData(){

     alert("2010-01-29".isDate());
     alert(!"2010-01-32".isDate());
     alert("2010-3-31".isDate());
     alert(!"1900-2-29".isDate());
     alert(!"1900-4-31".isDate());
     alert("1904-2-29".isDate());
}

String.prototype.isDateTime = function() {
    var   r   =   this.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})(\.[0-9]{1,3})?$/); 
    if(r==null)return   false;  
    var   d   =   new   Date(r[1], r[3]-1,r[4],r[5],r[6],r[7]); 
   return   (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]&&d.getHours()==r[5]&&d.getMinutes()==r[6]&&d.getSeconds()==r[7]);
   } ;
  
   String.prototype.isDate = function(){
   var   r   =   this.match(/^(\d[0-9]{1,4})(-|\/)(\d[0-9]{1,2})\2(\d[0-9]{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]);

   };
    String.prototype.isTime = function(){
     var   r   =   this.match(/^(\d{1,2}):(\d{1,2}):(\d{1,2})(\.[0-9]{1,3})?$/);
     if(r==null) return   false;
    
     return true;
    }

  

    function checkDate(){
    var df=document.getElementById('dateField');
    var info=df.value;
   
    if(info.length!=10){
      alert('The date format error! it must be yyyy-mm-dd!\n Example: 2010-02-05, 2010-12-05. ');
      return false;
    }
   
    var rs=info.isDate();
    if(!rs) {
      alert('The date format error ! '+info);
      return false;
    }else alert('right date format! '+info);
   
    }
    function checkDateTime(){
    var df=document.getElementById('datetimeField');
    var info=df.value;
   
    var index=info.indexOf('.');
    if(index<0&&info.length!=19||index>0&&index<19){
      alert('The date format error! it must be yyyy-MM-dd HH:mm:ss.S!\n Example: 2010-02-05 06:05:09, 2010-12-05 12:35:08, 2010-12-05 12:35:08.123 ');
      return false;
    }

    var rs=info.isDateTime();
    if(!rs) {
      alert('The datetime format error ! '+info);
      return false;
    }else alert('right datetime format! '+info);
  
    }
    function checkTime(){
    var df=document.getElementById('timeField');
    var info=df.value;
   
    var index=info.indexOf('.');
    if(index<0&&info.length!=8||index>0&&index<8){
      alert('The date format error! it must be HH:mm:ss.S!\n Example:06:05:09, 12:35:08, 12:35:08.123 ');
      return false;
    }

    var rs=info.isTime();
    if(!rs) {
      alert('The time format error ! '+info);
      return false;
    }else alert('right time format! '+info);
  
    }


</script>

<p>Date format: <input type="text" size="15" value="2010-02-19" id="dateField" ><button type=button onclick="checkDate()">Check</button>
<p>DateTime format: <input type="text" size="30"  id="datetimeField" ><button type=button onclick="checkDateTime()">Check</button>
<p>Time format: <input type="text" size="30"  id="timeField" ><button type=button onclick="checkTime()">Check</button>