PHP calculate half of 8 hour working day

Question

We have Moodle plugin, where we add the travel time of each employee. Until now, we calculated the duration of the travel time in days, as we added the data for every employee only in such form timepickup- 21.10.2105 timereturn-23.10.2015.

The data was being added in the function here:

$user->timepickup = gmdate("Y-m-d H:i", $timepickup);
$user->timereturn = gmdate("Y-m-d H:i", $timereturn);

And the calculating of the travel time here:

$datetime1 = strtotime($employee->timepickup);
$datetime2 = strtotime($employee->timereturn);
$interval = $datetime2 - $datetime1;

As you can see, we add the option to import the exact time in hours and minutes of the timepickup and timereturn.

How to calculate the travel time and display it in days and half days (we assume, that half day are 4 hours from the 8 hour working day.

So instead of travel time 1 day(s) for adding timepickup- 21.10.2105 08:00 timereturn-23.10.2015 12:00, we will have displayed 0,5 day(s).

Answer 1

Something like this could work

$pickup = strtotime($employee->timepickup);
$return = strtotime($employee->timereturn);
$timediff = ($return - $pickup) / 3600;

$days = floor($timediff / 8);
$halfday = ($timediff - $days * 8) / 4.5;

$days += $halfday < 1 ? 0.5: 1;

It's a bit crude, but you'll end up with adding a half day if the remainder of the time difference is 4.5 hours or less, and adding a whole day if the remainder is larger than 4.5.