How to extend service_length and step_in_minutes for specified dates?

Hello
I have specific case where I need to extend "Service Length" and "Step in Minutes" by 30 minutes
for three specified dates.
Can you suggest where to modify ajax.php or ajax.html.pgp or calendar.php top achieve this?
the logic should be something like this:
when clicked on calendar day
if
Selected Date equals 10.12.2025. or 15.12.2025. or 20.12.2025.
$service_length  = $service->service_total+"30";
$step_in_minutes = $service->step_in_minutes+"30";
else
$service_length  = $service->service_total;
$step_in_minutes = $service->step_in_minutes;

Is this possible?

Using OSB 2.22.6 and Joomla 5
Thanks

Hi,
Currently, there is no feature to add extra hours to timeslots on special days.
However, you can use the custom fields feature to create options that allow you to extend the booking time.
Thanks
Dam

Hi
Thanks for the info.
Didn't knew that new version has it implemented already.
Well, my client didn't want to spend extra $ for upgrade because they demanded customization for which needed to modify core files and if I upgrade I would need to redo it again.
Which is basically the same extra work because latest versions probably changed a lot of code in ajax.php, ajax.html.php and calendar.php files

Thanks,
regards

Hi,
We would like to clarify that this functionality has been available for quite some time and is not a newly introduced feature. Therefore, it cannot be considered as a recent addition to our system. As such, we are unable to accommodate the request to avoid the upgrade fee on the basis that the feature is new. The upgrade fee applies to all users wishing to access this functionality, as per our standard policy.

However, if you prefer not to upgrade in order to keep your core files unchanged, that is absolutely fine. If you need, we can offer a custom job to add a feature that allows you to increase the duration for specific timeslots on special days.

Please let us know if you are interested in this option or if you have any other questions.
Thanks
Dam

Hi

Fortunately I managed to solve my need.

In calendar.php, approx line 1100 I added this:

$HZselectedDateVar = sprintf('%02d.%02d.%04d.', $date[0], $date[1], $date[2]);
$HZspecialDates = ;

if (in_array($HZselectedDateVar, $HZspecialDates)) {
$step_in_minutes = (int)$step_in_minutes + 30;
}

So for hard-coded dates I got extra 30 minutes between sessions.

Ill update OSB next year and redo changes, but for this year client didn't want to spend on updates.

Regards