校验日期格式2008-01-01

校验日期格式2008-01-01

function  IsValidDate(dateStr){       
var datePat=/^(\d{4})(\-)(\d{1,2})(\-)(\d{1,2})$/;
 var matchArray = dateStr.match(datePat);   
    if (matchArray==null) {
   return false;   
    }   
    year=matchArray[1];   
    month=matchArray[3];   
    day=matchArray[5];    
 if (year.length!=4 || month.length!=2 || day.length!=2)   
    { 
     return false;   
    }   
    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 isleap=(year % 4==0 && (year % 100 !=0 || year % 400==0));   
        if (day>29 || ((day==29) && (!isleap)))   
        { 
            return false;   
        }   
    }
    return true;
  }