Hi Joe!
Thanks for reaching out!
I’m really sorry you are having this issue. Unfortunately, I could reproduce the issue myself by changing the datepicker format in Events > Settings > Display and the changes don’t take effect on the ticket start/end sale dates.
I have logged a bug report for this issue. I will link this thread to it and change the status to “Pending fix”. It will be addressed in one of our future maintenance releases and we will let you know as soon as a bugfix is released.
We don’t have a workaround at the moment, but we’ll keep you posted in case we come up with one.
I apologise for the inconvenience and we’d appreciate your patience with this matter.
Best,
Victor