I know that this can be edited in the Peepso core, but I want to be able to update the plugin.
I think I found a filter I can use to edit the postbox and allow another field. The form is for the activity stream for logged in users. I found where to add the form but need to know how to add the date field properly to the form.
Read more here:: Peepso: Add extra data field (custom post meta) to postbox