If you want to keep a record of timed or chronological events in your notes, such as a log of daily phone calls or the completion dates of tasks on your to-do list, you can insert your Mac’s current date and time anywhere in your notes.
Note: Inserting the current date and time is different from the page creation date and time stamp that OneNote automatically adds underneath the page title whenever you add a new page to your notebook.
In your notes, place the cursor where you want to insert the current date and time, and then do either of the following:
To insert the current date, click Insert > Date (or press Command-D).
To insert both the current date and the current time, click Insert > Date Time (or press Shift-Command-D).
OneNote uses the date and time format specified in your Mac’s regional settings. If you want to change the appearance of these formats, click the Apple menu > System Preferences. Next, double-click Date & Time, and then click Open Language & Region > Advanced > Dates (and/or Times).