Added a 'published' video parameter

src/invidious/jsonify/api_v1/video_json.cr

@@ -245,6 +245,7 @@ module Invidious::JSONify::APIv1
                 json.field "lengthSeconds", rv["length_seconds"]?.try &.to_i
                 json.field "viewCountText", rv["short_view_count"]?
                 json.field "viewCount", rv["view_count"]?.try &.empty? ? nil : rv["view_count"].to_i64
+                json.field "published", rv["published"]?.try { |t| Time.parse(t, "%Y-%m-%d", Time::Location::UTC).to_unix } || Time.utc
               end
             end
           end