The easiest fix you can do to pre-orders.
On the WooCommerce > Pre-Orders > Actions tab, why is the 'Change Release Date' option a text field instead of a date picker?
Of course the issue is that you don't know what the date format should be. For my store I looked up the product first and saw that it was yyyy-mm-day which wouldn't have been my first guess.
Also, when you use the change date feature, there is no option to change the time, which ends up getting reset from whatever you initially chose, to 00:00