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

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10.4.2 Time-of-day specifications

Org mode checks each agenda item for a time-of-day specification. The time can be part of the timestamp that triggered inclusion into the agenda, for example as in ‘<2005-05-10 Tue 19:00>. Time ranges can be specified with two timestamps, like ‘<2005-05-10 Tue 20:30>--<2005-05-10 Tue 22:15>.

In the headline of the entry itself, a time(range) may also appear as plain text (like ‘12:45’ or a ‘8:30-1pm’). If the agenda integrates the Emacs diary (see Weekly/daily agenda), time specifications in diary entries are recognized as well.

For agenda display, Org mode extracts the time and displays it in a standard 24 hour format as part of the prefix. The example times in the previous paragraphs would end up in the agenda like this:

         8:30-13:00 Arthur Dent lies in front of the bulldozer
        12:45...... Ford Prefect arrives and takes Arthur to the pub
        19:00...... The Vogon reads his poem
        20:30-22:15 Marvin escorts the Hitchhikers to the bridge

If the agenda is in single-day mode, or for the display of today, the timed entries are embedded in a time grid, like

         8:00...... ------------------
         8:30-13:00 Arthur Dent lies in front of the bulldozer
        10:00...... ------------------
        12:00...... ------------------
        12:45...... Ford Prefect arrives and takes Arthur to the pub
        14:00...... ------------------
        16:00...... ------------------
        18:00...... ------------------
        19:00...... The Vogon reads his poem
        20:00...... ------------------
        20:30-22:15 Marvin escorts the Hitchhikers to the bridge

The time grid can be turned on and off with the variable org-agenda-use-time-grid, and can be configured with org-agenda-time-grid.