It's true, entering a date for every scene is tedious, and I save myself the effort or wait until the revision. In any case, it pays off the most if you also use a specialized timeline software.
On the other hand, you can also make a complete plot outline with a timeline application if the course of the narrated time is particularly important, as in a mystery or a thriller with a “ticking clock” and changes of perspective. My utility programs such as
yw-timeline and
aeon2yw then turn this into a novel outline in yw7 format.
However, I do not actively develop these utilities any further. As you can see in the changelog, with the last releases I have mainly reacted to updates of the Python interpreter by reworking deprecated code. There were also some workarounds to process yw7 files that were generated with the iOS version in the wrong encoding or that contained invalid characters. From time to time I also check whether it still works after updating the Timeline software, as file format changes are also possible there.
In terms of convenience when entering dates, an option in yWriter that generates a start date from the end date of the previous scene at the click of a button would be helpful. And an option that can determine the duration from the start date of the following scene. Of course, all this can also be solved with auxiliary programs, and I myself now use my own novel organizer, which can do all this.
Exporting the scenes with date/time/duration to a speadsheet in order to edit them and then save them back would not be too much effort in terms of programming, but the documentation and long-term maintenance would be too time-consuming.
Speaking of documentation (which experience has shown that hardly anyone takes note of), for yw-timeline I have described how the date can be automatically converted to days when saving back to yw7 (and vice versa on export) if you select the corresponding option in a configuration file and specify a reference date.
Cheers,
Peter