PHP, need to subtract 12 hours and 30 minutes from a DateTime

Question

I have a PHP DateTime variable.

How can I reduce or subtract 12hours and 30 minutes from this date in at PHP runtime?

Answer 1

Subtract 12 Hours and 30 minutes from a DateTime in PHP:

$date = new DateTime();
$tosub = new DateInterval('PT12H30M');
$date->sub($tosub);

The P stands for Period. The T stands for Timespan.

See DateTime, DateTime::sub, and DateInterval in the PHP manual. You'll have to set the DateTime to the appropriate date and time, of course.

Answer 2

Try with:

$date = new DateTime('Sat, 30 Apr 2011 05:00:00 -0400');
echo $date->format('Y-m-d H:i:s') . "\n";
$date->sub(new DateInterval('PT12H30M'));
echo $date->format('Y-m-d H:i:s') . "\n";

//Result

2011-04-30 05:00:00
2011-04-29 16:30:00