Seriously,
There is a way better Open Source and free software for historic research.
I am near calling Aoen for word starting on “S” and ening on “am” regarding timelines for historical research.
There is no way to export a large timeline, neither to image nor pdf with an accuracy of weeks or days.
This is a desktop software where you can export your timeline to their web service…
The software can be found here: Running Reality - Download the App
If you have an organization that can install a web service for you, one of this 3 solutions may be better for most historical research: