PHP round the time to the nearest 15 seconds

Question

This is not a duplicate question, but involves a little understanding about time.

I need a solution to the following problem I have a number of specifically produced tim

Answer 1

Convert the date to seconds using strtotime and then just work in seconds.

$seconds = strtotime($date);
$seconds /= 15;
$seconds = round($seconds);
$seconds *= 15;
$date = date("Y-m-d H:i:s", $seconds);

Answer 2

$seconds = ($hr * 60 + $mn) * 60 + $sc; // convert to seconds
$rounded = round($seconds/15)*15;       // round
$sc = $rounded % 60;                    // get seconds
$mn = ($rounded - $sc) / 60 % 60;       // get minutes
$hr = ($rounded - $sc - $mn * 60) / 60; // get hours

Answer 3

You're massively overcomplicating this, just do rounding on the Unix timestamp level:

function roundMyTime($time)
{
  $time = strtotime($time);
  $time = 15*round($time/15);
  echo date('H:i:s', $time)."\n";
}
roundMyTime('18:35:17');
roundMyTime('18:35:27');
roundMyTime('18:35:37');
roundMyTime('18:35:47');
roundMyTime('18:35:57');
roundMyTime('18:36:07');
roundMyTime('18:36:17');

Outputs:

18:35:15
18:35:30
18:35:30
18:35:45
18:36:00
18:36:00
18:36:15

Demo here.