I found an interesting new way to find a future or past day, month, or year using PHP.To recaps we can find next and previous date from current date PHP
Here are few examples

     //TODAY'S DATE
     $today=  date("Y-m-d");
 
     //NEXT MONTH FROM FIRST OF THIS MONTH
     $next= date("Y-m-d",strtotime('+1 months', strtotime(date('Y-m-01', strtotime($today)))));

     //PREV MONTH FROM FIRST OF THIS MONTH    
     $next= date("Y-m-d",strtotime('-1 months', strtotime(date('Y-m-01', strtotime($today)))));
 
     //GET NEXT 10 DAYS FROM TODAY
    $next= date("Y-m-d",strtotime('+10 days', strtotime($today)));
 
     //REMOVE THE RECORD 1 YEAR FROM TODAY
    $next= date("Y-m-d",strtotime('+1 years', strtotime($today)));

It is much easier than using a timestamp and mktime() to calculate a new date. By this we can find next and previous date from current date PHP