If it's really crucial for you when you wrote which scene, you could go back to the old
version 5.2.1.2.
Here, each scene is saved in its own RTF file, and you can sort the directory by date in the Explorer.
Of course, you have to do without the advantages of the current yWriter version, and you cannot use the yw7 file format, which is actually better. However, it is not enough to create yw5 files with the current yWriter, because in this case, as far as I know, all RTF scene files are created at the same time with the last date.