I don't know when the problem occured but now, when I save post, the date fields are incorrect.
array( 'name' => 'Date de début', 'id' => 'start_price_date', 'type' => 'date', 'timestamp' => true, ),
I can set date with the Datepicker but when post saved, the result is that one.
I set April 16 2020, the values are incorrect and I have the Json in field.
Metabox : 5.2.10
Metabox AIO : 1.11.5
Can u replicate the problem ?