$workingWeek->addOpening(new Opening([
    'day' => Carbon::MONDAY, 'time' => '06:00', 'length' => 12 * 3600
]));
$workingWeek->addOpening($opening2);

$workingWeek->countOpenings();           // returns the count of the openings
$workingWeek->isOpenAt(Carbon::now());   // returns bool
$workingWeek->workingHours();            // returns the sum of the working hours of the openings

$opening->opensAt();  // Return a Carbon instance
$opening->closesAt(); // Return a Carbon instance

// Check wether the two Openings overlaps:
$opening1->overlaps($opening2); // returns bool
// Merge them:
$opening1->merge($opening2);

// Get the day value to instantiate an opening
Opening::dayOfWeek('monday') // returns 1

BusinessTime::dayFromString('Friday');  // returns 5
BusinessTime::dayToString(0);           // returns 'Sunday'
BusinessTime::hoursToSeconds(2);        // returns 7200
BusinessTime::secondsToHours(3600)      // returns 1