add hours:min:sec to date in PHP

Question

I am trying to add hh:mm:ss with the date. How can i do it?

I tried with the following but it works when the hour is string, but when adding time is similar to MySQL

Answer 1

You may also convert the time into seconds with this approach from: Convert time in HH:MM:SS format to seconds only?

$time = '03:05:01';
$seconds = strtotime("1970-01-01 $time UTC");

Then you could add the seconds to

$currentTime = '2015-10-10 13:40:14';
$newTime = date("Y-m-d H:i:s", strtotime( $currentTime.'+'.$seconds.' seconds'));

If you prefer to use the DateTime objects offered by @John Conde, here are two ways to convert the time string into the format:

$formattedTime = preg_replace("/(\d{2}):(\d{2}):(\d{2})/","PT$1H$2M$3S","03:05:11");

or, as you read it from the database:

select concat(hour(last_modified),'H',minute(last_modified),'M',second(last_modified),'H') from people;

So a more general code approach would be:

$initial = 'some time';
$interval = 'the interval value';

$initialTime = new DateTime($initial);
$intervalTime = new DateInterval($interval);
$initialTime->add($intervalTime);
echo $initialTime->format('Y-m-d H:i:s');