You want to modify this function in extensions/igniter/reservation/components/Booking.php
public function getTimePickerOptions()
{
$options = [];
$startTime = Carbon::createFromTime(00, 00, 00);
$endTime = Carbon::createFromTime(23, 59, 59);
$interval = new DateInterval("PT{$this->property('timePickerInterval')}M");
$dateTimes = new DatePeriod($startTime, $interval, $endTime);
foreach ($dateTimes as $dateTime) {
$options[$dateTime->format('H:i')] = Carbon::parse($dateTime)->isoFormat($this->timeFormat);
}
return $options;
}
