php: add days interval to date (unix timestamp)

Trabla: php: add days interval to date (unix timestamp)

Solving:

Example 1:

date_default_timezone_set('America/New_York');
$date = date_create( '2013-03-15' );
date_add($date, date_interval_create_from_date_string("40 days"));
//Get unix timestamp
echo date_timestamp_get($date);

Example 2:

date_default_timezone_set('America/New_York');
//Current time
$date = date_create( time() );
date_add($date, date_interval_create_from_date_string("40 days"));
//Get unix timestamp
echo date_timestamp_get($date);