When taking notes during, for example, a meeting or a video viewing, it can be useful to have access to times relative to a starting time. Org provides such a relative timer and make it easy to create timed notes.
Insert a relative time into the buffer. The first time you use this, the timer will be started. When called with a prefix argument, the timer is restarted.
Insert a description list item with the current relative time. With a prefix argument, first reset the timer to 0.
Once the timer list is started, you can also use M-RET to insert new timer items.
Pause the timer, or continue it if it is already paused
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.
Reset the timer without inserting anything into the buffer. By default, the timer is reset to 0. When called with a C-u prefix, reset the timer to specific starting offset. The user is prompted for the offset, with a default taken from a timer string at point, if any, So this can be used 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.