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GNU Emacs Manual

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AC.13 Summing Time Intervals

The timeclock feature adds up time intervals, so you can (for instance) keep track of how much time you spend working.

Use the M-x timeclock-in command when you start working on a project, and M-x timeclock-out command when you're done. Each time you do this, it adds one time interval to the record of the project.

Once you've collected data from a number of time intervals, you can use M-x timeclock-workday-remaining to see how much time is left to work today (assuming a typical average of 8 hours a day), and M-x timeclock-when-to-leave which will calculate when you're "done."

If you want Emacs to display the amount of time "left" of your workday in the mode line, either customize the timeclock-modeline-display variable and set its value to t, or invoke the M-x timeclock-modeline-display command.

Terminating the current Emacs session might or might not mean that you have stopped working on the project. If you'd like Emacs to ask you about this, set the value of the variable timeclock-ask-before-exiting to t (via M-x customize). By default, only an explicit M-x timeclock-out tells Emacs that the current interval is over.

The timeclock functions work by accumulating the data in a file called `.timelog' in your home directory. (On MS-DOS, this file is called `_timelog', since an initial period is not allowed in file names on MS-DOS.) You can specify a different name for this file by customizing the variable timeclock-file. If you edit the timeclock file manually, or if you change the value of any of timeclock's customizable variables, you should run the command M-x timeclock-reread-log to update the data in Emacs from the file.


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