Progress Logging (The Org Manual)

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### 5.3 Progress Logging

To record a timestamp and a note when changing a TODO state, call the command `org-todo` with a prefix argument.

`C-u C-c C-t` (`org-todo`)

  Prompt for a note and record a the time of the TODO state change. The note is inserted as a list item below the headline, but can also be placed into a drawer, see Tracking TODO state changes.

If you want to be more systematic, Org mode can automatically record a timestamp and optionally a note when you mark a TODO item as DONE, or even each time you change the state of a TODO item. This system is highly configurable, settings can be on a per-keyword basis and can be localized to a file or even a subtree. For information on how to clock working time for a task, see Clocking Work Time.