I used before Diarium, an app called MD.
https://apps.apple.com/app/id352263913
I have two years of data.
Is there a way to import the data in Diarium?
The app MD exports the data as one text file within all the days (on a choosable period)
Above each date entry it writes
Friday, 20 June 2025 08:18
Bla bla bla bla
Saturday, 21June 2025 09:05
Bla bla bla bla
Etc.
Or maybe you can add it on your migrate list?
