This tank can be joined, by composition, with a tank of your own to provide a quick tool for creating (and later editing) daily journal tiddlers in your tank.
You can join it with multiple different tanks for keeping both private and public journal content.
When visiting the comp you will be presented with a simple link to drag to your bookmarks bar. Later, when you click that link, it will take you to a tiddler in the target tank with today's date as the title.
This is a very simple comp, but useful nonetheless.