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function dateOffset($number, $datestring = "", $unit = "days",){

     if($datestring == ""){

       $datestring = date("Y-m-d");

     }

     $first = substr($number, 0, 1);

     if($first != "+" && $first != "-"){

       $symbol = "+ ";

     }else{

       $symbol = "";

     }

     return date("Y-m-d",strtotime($symbol . $number . $unit,strtotime($datestring)));

}

​

So if you just want today you can do

echo dateOffset(30);

​

Or you can do 7 days ago with 

echo dateOffset(-7);

​

Or what the day will be in 17 hours with

//can be hours, months, days, years, etc

echo dateOffset(17,"","hours");

Or you can do it from another date so 20 days from Jan 1, 2023

echo dateOffset(20,"2023-01-01");