If you use the TiddlyTools Calendar “edit journal” button (in the popup for each calendar date), it now automatically adds a journal-date field to the resulting Journal tiddler. @TW_Tones’ solution provides modified versions of the “New Journal” and “New Journal here” button actions in order to do the same thing for those individual toolbar and sidebar buttons, so it is a good idea to add his solution to the mix.
Note that Tony still needs to update his code to be in sync with the current TWCore $:/ControlPanel handling that now uses the text field instead of the tags field in $:/config/NewJournal/Tags.
-e