datetime - how do I subtract 24 hour from date time object in PHP

Question

I have the following code:

  $now = date("Y-m-d H:m:s");
  $date = date("Y-m-d H:m:s", strtotime('-24 hours', $now));

However, now it gives me this error:

A non well formed numeric value encountered in...

why is this?

Answer 1

$date = (new DateTime())->modify('-24 hours');

or

$date = (new DateTime())->modify('-1 day');

(The latter takes into account this comment as it is a valid point.)

Should work fine for you here. See http://PHP.net/datetime

$date will be an instance of DateTime, a real DateTime object.