[tz] [PATCH] Fixups for today’s patches

[Paul Eggert]

* NEWS: Mention the recent all-year DST change.
* zic.c (stringzone): Fix sign bug.
---
 NEWS  | 7 +++++++
 zic.c | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index af5dd9f..f3c94ed 100644
--- a/NEWS
+++ b/NEWS
@@ -20,6 +20,13 @@ Unreleased, experimental changes
     last time transition disagreed with the TZ string, contrary to
     Internet RFC 8563 section 3.3.
 
+    zic now generates a POSIX-conforming TZ string for TZif files
+    where all-year DST is predicted for the indefinite future.
+    For example, for all-year Eastern Daylight Time, zic now generates
+    "XXX3EDT4,0/0,J365/23" where it previously generated
+    "EST5EDT,0/0,J365/25" or "".  (Thanks to Michael Deckers for
+    noting the possibility of POSIX conformance.)
+
 
 Release 2021a - 2021-01-24 10:54:57 -0800
 
diff --git a/zic.c b/zic.c
index 4893a32..b91cb6c 100644
--- a/zic.c
+++ b/zic.c
@@ -2519,7 +2519,7 @@ stringzone(char *result, struct zone const *zpfirst, ptrdiff_t zonecount)
 		 Fake a timezone with negative DST.  */
 	      stdzp = &zstr[0];
 	      dstzp = &zstr[1];
-	      zstr[0].z_stdoff = zp->z_stdoff - 2 * save;
+	      zstr[0].z_stdoff = zp->z_stdoff + 2 * save;
 	      zstr[0].z_format = "XXX";  /* Any 3 letters will do.  */
 	      zstr[0].z_format_specifier = 0;
 	      zstr[1].z_stdoff = zstr[0].z_stdoff;
-- 
2.27.0