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<?
class DateClass
{
        var $strDate;
        var $intDate;
        var $nYear;
        var $nMonth;
        var $nDay;
        var $LastDay;
        var $ChangedDate;

        function DateClass()
        {
                return true;
        }
        function Init($date)
        {
                if(is_int($date)){

                        $this->intDate = $date;
                        $this->strDate = strftime("%Y-%m-%d",$date);
                }
                else $this->strDate = $date;

                $aDate = explode("-",$this->strDate);
                $this->nYear = $aDate[0];
                $this->nMonth = $aDate[1];
                $this->nDay = $aDate[2];
                $this->LastDay = strftime("%d",mktime(0,0,0,$this->nMonth+1,0,$this->nYear));
        }
        function addYear($date,$val)
        {
                if($date) $this->Init($date);
                $AddedDate = mktime(0,0,0,(int)$this->nMonth+1,0,$this->nYear+$val);
                $AddedLastDay = strftime("%d",$AddedDate);
                if($this->nDay >= $AddedLastDay) $this->ChangedDate = strftime("%Y-%m",$AddedDate)."-".$AddedLastDay;
                else $this->ChangedDate = strftime("%Y-%m-%d",mktime(0,0,0,$this->nMonth,$this->nDay,$this->nYear+$val));
                return $this->ChangedDate;
        }
        function addMonth($date,$val)
        {
                if($date) $this->Init($date);
                $AddedDate = mktime(0,0,0,($this->nMonth+$val)+1,0,$this->nYear);
                $AddedLastDay = strftime("%d",$AddedDate);
                if($this->nDay >= $AddedLastDay) $this->ChangedDate = strftime("%Y-%m",$AddedDate)."-".$AddedLastDay;
                else $this->ChangedDate = strftime("%Y-%m-%d",mktime(0,0,0,$this->nMonth+$val,$this->nDay,$this->nYear));
                return $this->ChangedDate;
        }
        function addDay($date,$val)
        {
                if($date) $this->Init($date);
                $AddedDay = mktime(0,0,0,$this->nMonth,$this->nDay+$val,$this->nYear);
                $this->ChangedDate = strftime("%Y-%m-%d",$AddedDay);
                return $this->ChangedDate;
        }
        function subYear($date,$val)
        {
                if($date) $this->Init($date);
                $SubedDate = mktime(0,0,0,(int)$this->nMonth+1,0,$this->nYear-$val);
                $SubedLastDay = strftime("%d",$SubedDate);
                if($this->nDay >= $SubedLastDay) $this->ChangedDate = strftime("%Y-%m",$SubedDate)."-".$SubedLastDay;
                else $this->ChangedDate = strftime("%Y-%m-%d",mktime(0,0,0,$this->nMonth,$this->nDay,$this->nYear-$val));
                return $this->ChangedDate;
        }
        function subMonth($date,$val)
        {
                if($date) $this->Init($date);
                $SubedDate = mktime(0,0,0,($this->nMonth-$val)+1,0,$this->nYear);
                $SubedLastDay = strftime("%d",$SubedDate);
                if($this->nDay >= $SubedLastDay) $this->ChangedDate = strftime("%Y-%m",$SubedDate)."-".$SubedLastDay;
                else $this->ChangedDate = strftime("%Y-%m-%d",mktime(0,0,0,$this->nMonth-$val,$this->nDay,$this->nYear));
                return $this->ChangedDate;
        }
        function subDay($date,$val)
        {
                if($date) $this->Init($date);
                $SubedDay = mktime(0,0,0,$this->nMonth,$this->nDay-$val,$this->nYear);
                $this->ChangedDate = strftime("%Y-%m-%d",$SubedDay);
                return $this->ChangedDate;
        }
}

?>