Adding Days to a Date with PHP

Question

I am trying to add a certain amount of days to a set date in PHP. However, all of the code I use is not working. Here is the code I am currently experiencing problems with:<

Answer 1

It must be like this:

$NewDate = date('Y-m-d', strtotime("2013-12-01" . " +7 days"));
echo $NewDate;                                   

Answer 2

For the sake of completeness, here's how you do it with DateTime():

$datetime = new DateTime("2013-12-01");
$datetime->add(new DateInterval('P7D'));
echo $datetime->format('Y-m-d');

or

$datetime = new DateTime("2013-12-01");
$datetime->modify('+7 days');
echo $datetime->format('Y-m-d');

Answer 3

You can use date_add() function:

$date = date_create('2013-12-01');
date_add($date, date_interval_create_from_date_string('7 days'));
echo date_format($date, 'Y-m-d');

This will output 2013-12-08