Insert User and Date is a Google Docs™ addon that inserts an identifier for the user (username) and the current date (ISO yyyy-mm-dd format in the  user's web browser's time zone) in square brackets at the cursor and leaves the cursor immediately after the insertion so the user can continue to type their entry. Users can optionally set an alias to use instead of their user name.

This is useful in shared docs where it is desired for specifically chosen author contributions to be immediately attributable, i.e. without having to search the version history.

E.g.

[alanjl, 2022-08-25] Here is an example.

User data policy summary: Insert User and Date does not retain or store any data attributable to a user. More details here:  Privacy Policy.