I did the update, but i breaks the same way it did when i build it myself. You can see the problem here: https://www.jlcoiffures.nl/afspraak-inplannen/
The problem is that automatic filled information is not good. Then when i open the calendar the first date is not ‘tomorrow’ but the first possible date in the last month of this year. When selecting ‘vandaag’ today and picking an date i keeps validating.
I noticed another thing in the backend aswell. I live in UTC+2 but when i do a booking it get’s my time (what is the right one) and ads 2 in the backend calander