How to test the calendar?

Hi,

there are already posts on this forum for how to test the calendar. But the answer was always that you can ONLY do it in admin by using Preview on the page with the calendar shortcode. But what when I want to give the client a chance to test it, who doesn’t have access to the admin?

I tried to change the computer date to December 1. and test then December 1. But this did not work. Does the plugin not use the computer date when it allows to open the calendar doors?

And I of course also want to know IN ADVANCE if the plugin works on the special days. So, those of you who used it last December: Does it work?

Thanks in advance for your answer.

Best regards

Albert