Usually a post indicates both when it was posted and when it was most recently edited
However community wikis only show when they were most recently edited
This probably makes sense for "true" community wikis where they are created as a wiki page. However; for normal posts which simply become community wiki this often leaves me confused.
This happens particularly often on meta, I have seen a community wikis dated today that seems to request something that already exists. This always throws me until I look at the revision history to see that actually the post is several years old and it is the request that led to the now existing feature. I have come dangerously close to commenting, informing them that the feature they are requesting already exists.
Can the asked/answered date be included on community wikis similar to how it is included on normal posts? I can see no disadvantage to retaining this information as it adds additional context to a post.