Bug #84065
Updated by Anja Leichsenring over 6 years ago
I use a form on a 8.7 instance with a date field in it. It used to work until latest patch update, the offending patch has been set as related to this ticket.
#1476107295: PHP Warning: Illegal string offset 'placeholder' in /var/www/html/typo3_inc/typo3_com/vendor/typo3/cms/typo3/sysext/form/Classes/ViewHelpers/Form/DatePickerViewHelper.php line 84