In my opinion Diarium should definitely have an option to show for how many days you have been writing in sequence.
That would work in any Diarium Platform
For example, in a widget or in a special place of an app it would say something like:
"28 days sequence! Well done"
I do find very interesting in other apps similar to Diarium and also a bit motivational.
What do you think?
P.S: I looked for this and couldn't found any request. Sorry if it is already requested...