I think the html export in Diarium is so cool! It is a fantastic way to have a nice overview of a certain period. Days, weeks, months and even years. The texts and the photos look nice in real size.
With an export at 'On this day' you would have a very nice overview of a certain day over all years. I am very involved with nature and, thanks to your program, I notice that many things happen exactly on the same day. For example, the first garden visit of the bird species 'Keep' (Fringilla montifringilla).
Other things happen very differently. For example, the loss of leaves from the trees. I have many daily photos that I link in Diarium. See also 'Add photo tags'.