Do you want to select all posts with the selected date from the form?
If so you can use something like this:
https://support.advancedcustomfields.com/forums/topic/order-by-subfield-values/
You can rework it for a meta_query like this:
'meta_query' => array(
array(
'key' => 'other_information_%_date',
'compare' => 'LIKE',
'value' => $rep_date,
'type' => 'DATE' //May not be necessary
)
Hope that helps, or if you got another solution I would love to see it 😀
