display-time-world does not exist yet.

etc/PROBLEMS

@@ -2198,9 +2198,9 @@ month names with consistent widths for some locales on some versions
 of Windows. This is caused by a deficiency in the underlying system
 library function.
 
-The functions set-time-zone-rule, and display-time-world (which uses it)
-give incorrect results for many non-US timezones.  This is due to a
-limitation in Windows handling of daylight savings.
+The function set-time-zone-rule gives incorrect results for many
+non-US timezones.  This is due to over-simplistic handling of
+daylight savings switchovers by the Windows libraries.
 
 Files larger than 4GB cause overflow in the size (represented as a
 32-bit integer) reported by `file-attributes'.  This affects Dired as