AS3: Date-Time Query

A Date-time query methods.

package engine 
{
 /**
  * @file CDateTimeQuery.as
  * @author Abhishek Kumar
  */
 public class CDateTimeQuery
 {
  
  public function CDateTimeQuery() 
  {
   
  }
  
  public static function isExpired(yyyy:Number, mm:Number, dd:Number):Boolean
  {
   var today:Date = new Date();
   var expiry:Date = new Date(yyyy, mm - 1, dd);
   var decision:Boolean = (today > expiry) ? true : false;
   return (decision);
  }
  
  public static function isValid(year:Number, month:Number, date:Number):Boolean
  {
   if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
   {
    return ((date >= 1 && date <= 31)?true:false);
   }
   else if (month == 4 || month == 6 || month == 9 || month == 11)
   {
    return ((date >= 1 && date <= 30)?true:false);
   }
   else if (month == 2)
   {
    if (year%100 == 0)
    {
     return ((year % 400 == 0) ? ((date >= 1 && date <= 29)?true:false) : ((date >= 1 && date <= 28)?true:false));
    }
    else if (year%4 == 0)
    {
     return ((date >= 1 && date <= 29)?true:false);
    }
    else
    {
     return ((date >= 1 && date <= 28)?true:false);
    }
   }
   return false;
  }
 }

}