The Diary plugin is based off the Journal plugin, but with many more additions and capabilities added. Instead of a single entry, users can start a new entry each calendar day. If enabled, they can go back and edit any previous entry. Also, if enabled, they can edit the date of any entry, which means they can add an entry for previously missed dates. This ALSO means you can make multiple entries for any given day. If, edit dates, is NOT enabled, and a user tries to change the hidden, time created, the attempt will be blocked, an entry put into the logs, and a notice placed in the feedback area for the teacher to see.

There are multiple statistics of character, word, sentence, and paragraph count. Included are unique words, unique one syllable short words, unique two syllable words, and unique three or more syllable words, which will help point out whether the user is using too many small words. In all, there are twenty different statistics that can be shown right after every entry.

Diary uses individual grades for rating each entry, and uses the Moodle Rating system for grades in the Moodle grade book. All the standard rating methods are supported. The user view lists the rating type and the current rating. The teacher report view, also lists the rating type and the current rating for each user, in their entry.

The current version of Diary includes automatic time released prompts. Auto-rating for each writing prompt can use characters, words, sentences, or paragraphs for automatic rating of the entry. All the teacher needs to do for the automatic rating is click a button to add the results to the entry's feedback, then save all the feedback.

When the teacher goes to the report page to grade entries, just like the Journal plugin, they only see the most recently created entry from each user. This is to help prevent a very long page scroll. Diary also uses Groups to help shorten the page. To help prevent extra scrolling, a save all feedback and return button is included between each entry. Since the v3.1.1 release, on the report page, there is now a link for each student that will let the teacher see all of the entries for the selected student. Each of the entries can be graded and feedback text added. Once the teacher is finished, click Save all feedback will update the data for each entry that was changed. If the teacher does not want to make changes, there is a button to take them back to the regular report page.

At the top of both the view and report pages, there is a tool bar. On the normal view page, the toolbar is hidden until the user makes at least one diary entry and saves it. The download results depends upon the user. A regular user (student) can download only their dairy entries, while a teachers gets everyone in the course's entries, and an admin gets all entries for the entire site.

The edit tool (pencil) opens for editing the entry at the top of the view page, and on the report page, it gets the current diary entry for marking.

Each of the directional arrows, sorts the list of entries on the view and report pages. If a teacher has skipped a day or two of grading, they will need to sort for, Lowest rated entries, to get entries they haven't marked yet. Or, even better, use the new link after their name on the report page, Get all Diary entries for this user. The resulting page will allow you to rate and provide feedback for any entry made by the selected user.

If the course format is set to, Weekly, the Days available, setting can be used to control how many days a Diary activity will be available for adding/editing entries. For weekly and any other course format, the Open time and Close time settings can be used to control when a Diary activity is available for adding/editing entries. If a diary activity is not open for adding/editing entries, previously made entries can still be read by the user, and the teacher can still grade entries.

Diary includes Moodle, Tags. It also lets the user turn On/Off the statistics display on the normal view page. If the user is a teacher or higher, the can toggle, Email now/Email later, so that the normal "maxeditingdelay" is bypassed or not.