This is the official manual for the latest Org-mode release.

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8.6 Taking notes with a timer

Org provides two types of timers. There is a relative timer that counts up, which can be useful when taking notes during, for example, a meeting or a video viewing. There is also a countdown timer.

The relative and countdown are started with separate commands.

C-c C-x 0     (org-timer-start)
Start or reset the relative timer. By default, the timer is set to 0. When called with a C-u prefix, prompt the user for a starting offset. If there is a timer string at point, this is taken as the default, providing a convenient way to restart taking notes after a break in the process. When called with a double prefix argument C-u C-u, change all timer strings in the active region by a certain amount. This can be used to fix timer strings if the timer was not started at exactly the right moment.
C-c C-x ;     (org-timer-set-timer)
Start a countdown timer. The user is prompted for a duration. org-timer-default-timer sets the default countdown value. Giving a numeric prefix argument overrides this default value. This command is available as ; in agenda buffers.

Once started, relative and countdown timers are controlled with the same commands.

C-c C-x .     (org-timer)
Insert the value of the current relative or countdown timer into the buffer. If no timer is running, the relative timer will be started. When called with a prefix argument, the relative timer is restarted.
C-c C-x -     (org-timer-item)
Insert a description list item with the value of the current relative or countdown timer. With a prefix argument, first reset the relative timer to 0.
M-<RET>     (org-insert-heading)
Once the timer list is started, you can also use M-<RET> to insert new timer items.
C-c C-x ,     (org-timer-pause-or-continue)
Pause the timer, or continue it if it is already paused.
C-c C-x _     (org-timer-stop)
Stop the timer. After this, you can only start a new timer, not continue the old one. This command also removes the timer from the mode line.