If you have several posts written on a given day and want to create one link to all of them, here's a little tip that will help you to achieve that.
Even though there is no direct way of getting this done, you can use Blogger's Archive feature as a workaround. All you should do is to set your archive frequency to Daily. (Settings -> Archiving -> Archive Frequency). Then the Archive widget will show a breakdown up to a single day. (see figure below)
Each day in the widget carries a link to a page that lists all the posts in that day. That's the reference you need to use to link to all posts of a given day. Even if you don't have the Archive widget, you can still make up the URL for a given day. It has the format http://<your blog address>/YYYY_MM_DD_archive.html.