Modificar Reloj en Gnome 2

Cambiar formato y apariencia

En Gnome es posible cambiar el aspecto del applet del Reloj por medio del uso de css y Strftime.

• Ejecutar gconf-editor (desde un terminal o con Alt+F2)
• Buscar en el panel de la izquierda apps → panel → applets → clock_screen0 → prefs
• Cambiar el valor del campo custom_format, por ejemplo con:

<span size="smaller" color="#FD4747"> %a %d %b </span>  <b>%H:%M</b>

• Cambiar el valor del campo format por custom
• Cerrar el editor y veremos los cambios realizados

Para volver al formato original debemos dejar en blanco el campo custom_format y escribir 12-hour o 24-hour en el campo format.

El campo custom_format especifica el formato usado por el applet del reloj cuando el campo format contiene el valor custom. Se puede utilizar Css y Strftime para cambiar la apariencia del applet.

El campo format especifica el formato del Reloj. Los posibles valores son 12-hour, 24-hout, internet, unix y custom

Información sobre CSS en : CSS Learning

Referencia sobre Strftime :

%a	Weekday name, abbreviated
%A	Weekday name
%b	Month name, abbreviated
%B	Month name
%c	Preferred date-and-time representation for the current locale
%C	Century number, expressed as a two-digit integer in the range 00-99
%d	Day of the month, expressed as a two-digit integer in the range 01-31
%D	Same as %m/%d/%y
%e	Day of the month, expressed as an unpadded one-digit or two-digit integer in the range1-31
%h	Same as %b
%H	Hour, expressed as a two-digit integer in 24-hour clock format in the range00-24
%I	Hour, expressed as a two-digit integer in 12-hour clock format in the range00-12
%j	Day of the year, expressed as a three-digit integer in the range 001-366
%m	Month, expressed as an integer in the range01-12
%M	Minute, expressed as an integer in the range00-59
%n	Newline character (ASCII0×10)
%p	The string’AM’or’PM’ as appropriate for the given time (may be translated for the current locale)
%r	Time in 12-hour clock format with seconds; same as %I:%M:%S %p
%R	Time in 24-hour clock format without seconds; same as %H:%M
%S	Seconds, expressed as a two-digit decimal number in the range 00-59
%t	Tab character (ASCII0×9)
%T	Time in 24-hour clock format with seconds; same as %H:%M:S
%u	Weekday expressed as a single-digit integer in the range 1-7, where Monday is day1
%U	Week number, expressed as an integer in the range 00-53, where the first Sunday is the first day of the first week
%V	Week number, expressed as an integer in the range 00-53, where week01 is the first week with four or more of its days within the year, and Monday as the first day of the week (ISO 8601:1998 format)
%W	Week number, expressed as an integer in the range 00-53, where the first Monday is the first day of the first week
%x	Date expressed in the preferred representation for the current locale, not including the time
%X	Time expressed in the preferred representation for the current locale, not including the date
%y	Year, expressed as a two-digit integer in the range 00-99
%Y	Year, expressed as a two-digit integer in the range 1970-2037
%Z	Current time zone or its name or abbreviation
%%	Literal percent sign

Cambiar color

En los foros de Ubuntu hay una solucion para cambiar el color del reloj http://ubuntuforums.org/showthread.php?t=342575:

Crear un archivo llamado .gtkrc-2.0 en su directorio raíz y copiar el siguiente código :

style "panel-clock"
{
  fg[NORMAL] = "#000000"
}
widget "*.clock-applet-button.*" style "panel-clock"

(Cambiar #000000 por el color deseado.)
Guardar el archivo y reinciar la sesión.