I recently came across Aeon Timeline and I’m advocating for Logseq to have something similar in the future.
I believe that being self-aware leads to kindness. So I would personally use it to see the timeline of my thoughts. You’d be able to see which events made you react in certain ways. You’d be able to see the themes of your life, the motifs, the recurring thoughts that form the story that you tell yourself.
I also think it would be great for learning. You’d be able to see how your understanding of a topic has evolved over time.
Plus, you would have all the traditional uses of a timeline 
A timeline view, being able to plot nodes on a timeline, will be a great addition to Logseq.
I think currently Logseq only stores information about:
- file creation time
- last file modification time
- TODO/DOING period start and end times.
Which seem like they probably aren’t sufficient? So if you wanted to manually define time lines, you’d probably need a plugin to add that.
Out of interest, what kinds of things would you be putting on the timeline? And what would the times represent?
Tangentially, I’ve thought recently that it could be cool to have something like the graph view, but with Journal pages fixed linearly in time in the horizontal dimension, and other pages linking back to the journals to embed them in time. Not sure how well it would work though, could be messy.
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i sustain both your ideas 
In the new DB version you could add end time property to the #journal tag. But that said I’m not sure if the journal itself would be the best place. The groundwork for different views are there though and I really hope plugins can introduce new views so we can have things like this timeline view without having to adjust the core app.
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