Call "CST" a time zone abbreviation, not a name

In documentation, call strings like "CST" time zone abbreviations, not
time zone names.  This terminology is more precise, and is what tzdb uses.
A string like "CST" is ambiguous and does not fully name a time zone.

manual/conf.texi

@@ -85,10 +85,10 @@ If defined, the unvarying maximum number of streams that a single
 process can have open simultaneously.  @xref{Opening Streams}.
 @end deftypevr
 
-@cindex limits, time zone name length
+@cindex limits, time zone abbreviation length
 @deftypevr Macro int TZNAME_MAX
 @standards{POSIX.1, limits.h}
-If defined, the unvarying maximum length of a time zone name.
+If defined, the unvarying maximum length of a time zone abbreviation.
 @xref{Time Zone Functions}.
 @end deftypevr
 
@@ -1044,7 +1044,7 @@ simultaneously.  Its value is @code{8}.
 @item _POSIX_TZNAME_MAX
 @standards{POSIX.1, limits.h}
 The value of this macro is the most restrictive limit permitted by POSIX
-for the maximum length of a time zone name.  Its value is @code{3}.
+for the maximum length of a time zone abbreviation.  Its value is @code{3}.
 
 @item _POSIX2_RE_DUP_MAX
 @standards{POSIX.2, limits.h}

manual/time.texi

@@ -1025,7 +1025,7 @@ The @code{tm_gmtoff} field is derived from BSD and is a GNU library
 extension; it is not visible in a strict @w{ISO C} environment.
 
 @item const char *tm_zone
-This field is the name for the time zone that was used to compute this
+This field is the abbreviation for the time zone that was used to compute this
 broken-down time value.  Like @code{tm_gmtoff}, this field is a BSD and
 GNU extension, and is not visible in a strict @w{ISO C} environment.
 @end table
@@ -2205,7 +2205,7 @@ The full alternative year representation.
 The offset from GMT in @w{ISO 8601}/RFC822 format.
 
 @item %Z
-The timezone name.
+The time zone abbreviation.
 
 @emph{Note:} Currently, this is not fully implemented.  The format is
 recognized, input is consumed but no field in @var{tm} is set.
@@ -2366,7 +2366,7 @@ current time of the timezone matched, not of the current timezone of the
 runtime environment.
 
 @emph{Note}: This is not implemented (currently).  The problem is that
-timezone names are not unique.  If a fixed timezone is assumed for a
+time zone abbreviations are not unique.  If a fixed time zone is assumed for a
 given string (say @code{EST} meaning US East Coast time), then uses for
 countries other than the USA will fail.  So far we have found no good
 solution to this.
@@ -2522,10 +2522,10 @@ summer time) in the local time zone:
 @r{@var{std} @var{offset}}
 @end smallexample
 
-The @var{std} string specifies the name of the time zone.  It must be
+The @var{std} string specifies the time zone abbreviation.  It must be
 three or more characters long and must not contain a leading colon,
 embedded digits, commas, nor plus and minus signs.  There is no space
-character separating the time zone name from the @var{offset}, so these
+character separating the time zone abbreviation from the @var{offset}, so these
 restrictions are necessary to parse the specification correctly.
 
 The @var{offset} specifies the time value you must add to the local time
@@ -2549,7 +2549,7 @@ The second format is used when there is Daylight Saving Time:
 @end smallexample
 
 The initial @var{std} and @var{offset} specify the standard time zone, as
-described above.  The @var{dst} string and @var{offset} specify the name
+described above.  The @var{dst} string and @var{offset} are the abbreviation
 and offset for the corresponding Daylight Saving Time zone; if the
 @var{offset} is omitted, it defaults to one hour ahead of standard time.
 
@@ -2678,10 +2678,10 @@ community of volunteers and put in the public domain.
 @deftypevar {char *} tzname [2]
 @standards{POSIX.1, time.h}
 The array @code{tzname} contains two strings, which are the standard
-names of the pair of time zones (standard and Daylight
-Saving) that the user has selected.  @code{tzname[0]} is the name of
+abbreviations of the pair of time zones (standard and Daylight
+Saving) that the user has selected.  @code{tzname[0]} abbreviates
 the standard time zone (for example, @code{"EST"}), and @code{tzname[1]}
-is the name for the time zone when Daylight Saving Time is in use (for
+abbreviates the time zone when Daylight Saving Time is in use (for
 example, @code{"EDT"}).  These correspond to the @var{std} and @var{dst}
 strings (respectively) from the @code{TZ} environment variable.  If
 Daylight Saving Time is never used, @code{tzname[1]} is the empty string.

posix/bits/posix1_lim.h

@@ -134,7 +134,7 @@
 /* Maximum number of characters in a tty name.  */
 #define	_POSIX_TTY_NAME_MAX	9
 
-/* Maximum length of a timezone name (element of `tzname').  */
+/* Maximum length of a time zone abbreviation (element of 'tzname').  */
 #ifdef __USE_XOPEN2K
 # define _POSIX_TZNAME_MAX	6
 #else

time/mktime.c

@@ -536,7 +536,7 @@ __time64_t
 __mktime64 (struct tm *tp)
 {
   /* POSIX.1 8.1.1 requires that whenever mktime() is called, the
-     time zone names contained in the external variable 'tzname' shall
+     time zone abbreviations contained in the external variable 'tzname' shall
      be set as if the tzset() function had been called.  */
   __tzset ();
 

time/time.h

@@ -215,7 +215,7 @@ extern char *__REDIRECT_NTH (ctime_r, (const time_t *__restrict __timer,
 
 
 /* Defined in localtime.c.  */
-extern char *__tzname[2];	/* Current timezone names.  */
+extern char *__tzname[2];	/* Current time zone abbreviations.  */
 extern int __daylight;		/* If daylight-saving time is ever in use.  */
 extern long int __timezone;	/* Seconds west of UTC.  */
 

time/tzfile.c

@@ -408,7 +408,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 
   fclose (f);
 
-  /* First "register" all timezone names.  */
+  /* First "register" all time zone abbreviations.  */
   for (i = 0; i < num_types; ++i)
     if (__tzstring (&zone_names[types[i].idx]) == NULL)
       goto ret_free_transitions;
@@ -565,7 +565,7 @@ __tzfile_default (const char *std, const char *dst,
   types[1].offset = dstoff;
   types[1].isdst = 1;
 
-  /* Reset the zone names to point to the user's names.  */
+  /* Reset time zone abbreviations to point to the user's abbreviations.  */
   __tzname[0] = (char *) std;
   __tzname[1] = (char *) dst;
 

time/tzset.c

@@ -145,7 +145,7 @@ compute_offset (unsigned int ss, unsigned int mm, unsigned int hh)
   return ss + mm * 60 + hh * 60 * 60;
 }
 
-/* Parses the time zone name at *TZP, and writes a pointer to an
+/* Parses the time zone abbreviation at *TZP, and writes a pointer to an
    interned string to tz_rules[WHICHRULE].name.  On success, advances
    *TZP, and returns true.  Returns false otherwise.  */
 static bool
@@ -324,10 +324,10 @@ __tzset_parse_tz (const char *tz)
   memset (tz_rules, '\0', sizeof tz_rules);
   tz_rules[0].name = tz_rules[1].name = "";
 
-  /* Get the standard timezone name.  */
+  /* Get the standard time zone abbreviations.  */
   if (parse_tzname (&tz, 0) && parse_offset (&tz, 0))
     {
-      /* Get the DST timezone name (if any).  */
+      /* Get the DST time zone abbreviation (if any).  */
       if (*tz != '\0')
 	{
 	  if (parse_tzname (&tz, 1))

timezone/tst-bz28707.c

@@ -37,7 +37,7 @@ do_test (void)
   tzset ();
 
   return
-    /* Sanity-check that we got the right timezone-name for DST.  For
+    /* Sanity-check that we got the right abbreviation for DST.  For
        normal time, we're likely to get "-00" (the "unspecified" marker),
        even though the POSIX timezone string says "-04".  Let's not test
        that.  */