You might want to automatically keep track of when a state change
occurred and maybe take a note about this change. You can either
record just a timestamp, or a time-stamped note. These records are
inserted after the headline as an itemized list, newest first43.
When taking a lot of notes, you might want to get the notes out of the
way into a drawer (see Drawers). Customize the variable
org-log-into-drawer to get this behavior—the recommended drawer
for this is called ‘LOGBOOK’44. You can also overrule the
setting of this variable for a subtree by setting a ‘LOG_INTO_DRAWER’
Since it is normally too much to record a note for every state, Org mode expects configuration on a per-keyword basis for this. This is achieved by adding special markers ‘!’ (for a timestamp) or ‘@’ (for a note with timestamp) in parentheses after each keyword. For example, with the setting
(setq org-todo-keywords '((sequence "TODO(t)" "WAIT(w@/!)" "|" "DONE(d!)" "CANCELED(c@)")))
You not only define global TODO keywords and fast access keys, but also request that a time is recorded when the entry is set to ‘DONE’, and that a note is recorded when switching to ‘WAIT’ or ‘CANCELED’45. The setting for ‘WAIT’ is even more special: the ‘!’ after the slash means that in addition to the note taken when entering the state, a timestamp should be recorded when leaving the ‘WAIT’ state, if and only if the target state does not configure logging for entering it. So it has no effect when switching from ‘WAIT’ to ‘DONE’, because ‘DONE’ is configured to record a timestamp only. But when switching from ‘WAIT’ back to ‘TODO’, the ‘/!’ in the ‘WAIT’ setting now triggers a timestamp even though ‘TODO’ has no logging configured.
You can use the exact same syntax for setting logging preferences local to a buffer:
#+TODO: TODO(t) WAIT(w@/!) | DONE(d!) CANCELED(c@)
To record a timestamp without a note for TODO keywords configured with ‘@’, just type C-c C-c to enter a blank note when prompted.
In order to define logging settings that are local to a subtree or
a single item, define a ‘LOGGING’ property in this entry. Any
non-empty ‘LOGGING’ property resets all logging settings to
You may then turn on logging for this specific tree using ‘STARTUP’
keywords like ‘lognotedone’ or ‘logrepeat’, as well as adding state
specific settings like ‘TODO(!)’. For example:
* TODO Log each state with only a time :PROPERTIES: :LOGGING: TODO(!) WAIT(!) DONE(!) CANCELED(!) :END: * TODO Only log when switching to WAIT, and when repeating :PROPERTIES: :LOGGING: WAIT(@) logrepeat :END: * TODO No logging at all :PROPERTIES: :LOGGING: nil :END:
See the variable
Note that the ‘LOGBOOK’ drawer is unfolded when pressing SPC in the agenda to show an entry—use C-u SPC to keep it folded here.
It is possible that Org mode records two timestamps when you
are using both
org-log-done and state change logging. However, it
never prompts for two notes: if you have configured both, the state
change recording note takes precedence and cancel the closing note.