add days to string date in php code example

Example 1: php date strtotime add days

// add 1 day to the date above
$n = date('Y-m-d', strtotime( $d . " +1 days"));

// add 1 month to the date above
$n = date('Y-m-d', strtotime( $d . " +1 month"));

// add 1 year to the date above
$n = date('Y-m-d', strtotime( $d . " +1 year"));

// subtract 1 day to the date above
$n = date('Y-m-d', strtotime( $d . " -1 days"));

// subtract 1 month to the date above
$n = date('Y-m-d', strtotime( $d . " -1 month"));

// subtract 1 year to the date above
$n = date('Y-m-d', strtotime( $d . " -1 year"));

Example 2: Add days to date in PHP

$date = new DateTime('2020-11-24');
$date->add(new DateInterval("P9D"));

echo $date->format('Y-m-d');