(zoneinfo-style-world-list, legacy-style-world-list): New defcustoms.

(display-time-world-list): Use them as appropriate for the current value
of `system-type'.

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 7a55a5c..a009176 100644 (file)
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2007-10-27  Eli Zaretskii  <eliz@gnu.org>
+
+       * time.el (zoneinfo-style-world-list, legacy-style-world-list):
+       New defcustoms.
+       (display-time-world-list): Use them as appropriate for the current
+       value of `system-type'.
+
 2007-10-26  Vinicius Jose Latorre  <viniciusjl@ig.com.br>
 
        * printing.el: Pacify byte compiler, that is, no compiler warnings.

diff --git a/lisp/time.el b/lisp/time.el
index 4d94fb7..a048c97 100644 (file)
--- a/lisp/time.el
+++ b/lisp/time.el
@@ -112,17 +112,53 @@ A value of nil means 1 <= hh <= 12, and an AM/PM suffix is used."
    "Time when mail file's file system was recorded to be down.
 If that file system seems to be up, the value is nil.")
 
-(defcustom display-time-world-list
+(defcustom zoneinfo-style-world-list
   '(("America/Los_Angeles" "Seattle")
     ("America/New_York" "New York")
     ("Europe/London" "London")
     ("Europe/Paris" "Paris")
     ("Asia/Calcutta" "Bangalore")
     ("Asia/Tokyo" "Tokyo"))
-  "Alist specifying time zones and places for `display-time-world'.
+  "Alist of zoneinfo-style time zones and places for `display-time-world'.
+Each element has the form (TIMEZONE LABEL).
+TIMEZONE should be a string of the form AREA/LOCATION, where AREA is
+the name of a region -- a continent or ocean, and LOCATION is the name
+of a specific location, e.g., a city, within that region.
+LABEL is a string to display as the label of that TIMEZONE's time."
+  :group 'display-time
+  :type '(repeat (list string string))
+  :version "23.1")
+
+(defcustom legacy-style-world-list
+  '(("PST8PDT" "Seattle")
+    ("EST5EDT" "New York")
+    ("BST0BDT" "London")
+    ("CET-1CDT" "Paris")
+    ("IST-5:30IDT" "Bangalore")
+    ("JST-9JDT" "Tokyo"))
+  "Alist of traditional-style time zones and places for `display-time-world'.
+Each element has the form (TIMEZONE LABEL).
+TIMEZONE should be a string of the form:
+
+     std[+|-]offset[dst[offset][,date[/time],date[/time]]]
+
+See the documentation of the TZ environment variable on your system,
+for more details about the format of TIMEZONE.
+LABEL is a string to display as the label of that TIMEZONE's time."
+  :group 'display-time
+  :type '(repeat (list string string))
+  :version "23.1")
+
+(defcustom display-time-world-list
+  (if (memq 'system-type '(gnu/linux ms-dos))
+      zoneinfo-style-world-list
+    legacy-style-world-list)
+  "Alist of time zones and places for `display-time-world' to display.
 Each element has the form (TIMEZONE LABEL).
-TIMEZONE should be a valid argument for `set-time-zone-rule'.
-LABEL is a string to display to label that zone's time."
+TIMEZONE should be in the format supported by `set-time-zone-rule' on
+your system.  See the documentation of `zoneinfo-style-world-list' and
+\`legacy-style-world-list' for two widely used formats.
+LABEL is a string to display as the label of that TIMEZONE's time."
   :group 'display-time
   :type '(repeat (list string string))
   :version "23.1")