Question

if i have 2 time variables:

    a = 00:00:12 and b = 00:00:05

how would i add them together to make :

    c = 00:00:17 ?

then i need to divide them to crate an average,
but im stuck on the add part.

i get the data from the database in this format and when i try a simple :

    c=a+b;

i get :

    00

how do i implement simple math operations on a time variable?

Answer 1

Or you simply go straight forward 😉

<?php
$a = "00:00:12";
$b = "00:00:05";

function addTime($timeA, $timeB) {
    $timeAcomponents = explode(":", $timeA);
    $timeBcomponents = explode(":", $timeB);

    $timeAinSeconds = $timeAcomponents[0]*60*60 + $timeAcomponents[1]*60 + $timeAcomponents[2];
    $timeBinSeconds = $timeBcomponents[0]*60*60 + $timeBcomponents[1]*60 + $timeBcomponents[2];

    $timeABinSeconds = $timeAinSeconds + $timeBinSeconds;

    $timeABsec = $timeABinSeconds % 60;
    $timeABmin = (($timeABinSeconds - $timeABsec) / 60) % 60;
    $timeABh = ($timeABinSeconds - $timeABsec - $timeABmin*60) / 60 / 60;

    return str_pad((int) $timeABh,2,"0",STR_PAD_LEFT).":"
          .str_pad((int) $timeABmin,2,"0",STR_PAD_LEFT).":"
          .str_pad((int) $timeABsec,2,"0",STR_PAD_LEFT);
}

echo "Adding time variables:\n";
echo "$a + $b = ".addTime($a, $b);
?>