Getting dates in PHP : 
echo date("d-m-Y"); // Today

$tomorrow  = mktime(0, 0, 0, date("m")  , date("d")+1, date("Y"));  // tomorrow
echo date('d-m-Y',$tomorrow);

$lastmonth = mktime(0, 0, 0, date("m")-1, date("d"),   date("Y"));  //  lastmonth
echo date('d-m-Y',$lastmonth);

$nextyear  = mktime(0, 0, 0, date("m"),   date("d"),   date("Y")+1);  //  nextyear
echo date('d-m-Y',$nextyear);

$afterAweek  = mktime(0, 0, 0, date("m")  , date("d")+7, date("Y"));  // after a week
echo date('d-m-Y',$afterAweek);
