======Synopsis:======
[[set]] clock_24hour [on|off|toggle]

======Description:======
When turned on, this setting causes EPIC's clock to display time
in 24-hour format.  When off, EPIC displays time in 12-hour format,
using "AM" and "PM".

The EPIC clock is shown in the status bar by the %T expando, and is available
to scripts in the $Z [[special vars|special variable]].