A PHP library to calculate business hours between two dates
composer require raupp/business-hours-diff
$businessOpensAt = 9;
$businessClosesAt = 19;
$date1 = Carbon::parse('2018-04-01 08:02');
$date2 = Carbon::parse('2018-04-01 22:39');
$minutes = (new BusinessHoursDiff())
->businessOpensAt(9)
->businessClosesAt(19)
->diff($date1, $date2);
echo $minutes; // 600