A Diary is a macro on a page. You insert it once - and from then on everything happens in view mode.
Inserting it
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Open the page you want the Diary on and click Edit.
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Type
/Diaryand choose Diary, or open the macro browser and search for it there.
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Publish the page.
You now have an empty Diary, with a short welcome message and - if you may edit the page - an editor prompt waiting for the first entry:
Configuring it
Click the macro and choose the configuration button to open the macro settings. Ten settings control the order of entries, the style, where the editor sits, whether a title and the time are shown, how many entries fit on a page, and which template new entries start from. Every one of them is described in Macro Settings.
Every parameter is a display or authoring choice. Changing one never rewrites your entries, so you can experiment freely on a diary that already has content in it.
More than one Diary on a page
You can put several Diary macros on the same page. Each keeps its own entries and its own parameters, so a project page can carry a decision log and a status log side by side without the two mixing.
Moving and copying pages
Because the entries travel inside the page body, copying a page copies its Diary entries and moving a page moves them. There is nothing to re-point afterwards, and no app data left behind.