This Add-on allows you to create new dated journal entries with hte click of a button. You can also customize the format of your date. Dates are always placed at the end of a document as a heading level 1
You can format the date by going the menu and clicking "Change Date Format"
Add your dated entry by clicking "New Entry"
Date formats are created using Java Simple Date Format.
You can view the available settings and examples in the java documentation here