If you want to link previous diaries with your current one, you can use the link function.
How to link diaries?
1.Go to grid view of your target diary, click the "..." on the top right corner.
2.Click "Copy"->Choose "Copy Markdown Link", wait for the "Copied" window pop up.
3.Click into one grid of you new diary, tap the blank writing space and click "Paste" to add the link (show as its date).
4.Now if you preview this new diary, and then you can click the link to return to this target diary.