If you press a to open the add form, then tab to accept the pre-filled date value ("today"), it is cleared. This is very annoying when you fill out the add form, it is rejected due to the empty date, and all field values are lost (#337).
When visiting the form directly with localhost:5000/journal?add=1, it doesn't happen.
web: leave date field blank, avoid problems (#322)
As this is specifically mentioned on sandstorm, reopening until the fix lands there.
This was fixed (or avoided) by the 1.0.1-sandstorm1 release last month.