This feature is aimed for people writing a travel diary where they are writing and taking photos but do not have a lot of time to tag or organize the photos.
The feature allows you to fetch photos from Flickr where the date the photo was taken is the same as the publication date of the blog post.
To use this feature set the following parameter:
date="publish"
This means that photos displayed in the gallery for the blog post are the ones for that particular day.