osConcert Version 9 is simple to set up correctly. Just follow this  procedure and you will get it.

Let's first update a setting to make it easier to set a correct DATE ID

A DATE ID is a unique ID required for reporting and scanning features throughout osConcert.

Goto your seat plan settings and set Fill DATE-ID this will create a DATE-ID automatically when you set the Date and Time and Save the listing.

Now we must goto Admin>Concert Details

It's important to set the DATE with the Date Picker and write the 24 hour TIME e.g 2000 (=8:00pm)

In conclusion setting a date from the datepicker 30-10-2022 and write a time 2000 we will get a DATE ID set automatically as 30-10-2022 2000 and at the Front End the Date and Time will read Sunday, October 30th 8:00pm or whatever way your server locale is set for your country/region.