Chronometer is a digital clock with large easy to read digits and features the following:

The time is displayed with seconds as HH:MM:SS.
The time can be shown in 12 (AM/PM) or 24 hour format.
An hourly chime can be sounded.
A daily alarm can be set. The alarm will sound each day at the set time, and features a 'snooze' which will repeat the alarm 5 minutes later.
A world time can be set. The time is displayed along with the name of the associated place.
The date is displayed as day-date-month-year.
The current month as a weekday calendar.
The season of the year is shown as an icon before the date.
The current star-sign symbol and name is shown.
An appropriate icon and the name of the day is shown for special days, e.g. Christmas, New Year, etc.
The battery power is displayed.
The auto power off can be overridden. Note that exiting Chronometer or running another program will always restore the original auto-off settings of your device, i.e. the disable auto-off only applies while Chronometer is running.
The display, or not, of all items (except the time) can be set using the Preferences.
Preferences are automatically saved.