Hello. Thank you for contacting the Toolset support.
That is really strange. I would like to know how you setup the custom date field and where you are trying to display it.
Can you please share problem URL where you are trying to display date field and what date field you want to display.
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.