If you're using vim already for journaling, you should try Vimwiki. Out of the box, it has a diary, and typing Leader-W-Leader-W opens a buffer with today's dia

If you're using vim already for journaling, you should try Vimwiki. Out of the box, it has a diary, and typing Leader-W-Leader-W opens a buffer with today's diary file, ready to record things you've done or serve as a scratchpad for the day that you can search and refer to later.