如何在PHP的DateTime中说“下个月15日”？

Question

What I want to do:

Getting a certain day from a certain month directly via the DateTime methods (no mktime stunts :)), like

$day = new DateTime('15th of next month');

but it's not possible to set a fixed day by it's number. Can anybody help ?

EDIT: I've changed the DateTime from this month to next month to make the problem more clear.

Answer 1

You can use DateTime::createFromFormat() . If you only pass the day value, it'll default to the current month and year.

$date = DateTime::createFromFormat('d', '15');

echo $date->format('Y-m-d'); // 2018-10-15

Edit for the new question requirements:

$date = DateTime::createFromFormat('d', 15)->add(new DateInterval('P1M'));

echo $date->format('Y-m-d'); // 2018-11-15