This plugin allows you to set deadline for posts and list posts with upcoming deadlines via shortcode.
Plugin is intended to be used with P2 theme or o2 plugin, but can also work without it – only P2/o2 spesific functionality is datepicker field added to frontend post submit area. Datepicker for setting deadline is also available in classic editor and Gutenberg.
Plugin also automatically adds deadline to the end of the_content output if deadline is set. List of posts with upcoming deadlines are cached to transients to reduce amount of databse queries in large scale sites.