diff --git a/agent/BACKLOG.md b/agent/BACKLOG.md
index b512ead..af7a49e 100644
--- a/agent/BACKLOG.md
+++ b/agent/BACKLOG.md
@@ -234,7 +234,6 @@ them as composable commands, not dead ends.
 - **Night-light geo mode**: lat/long auto sunset/sunrise (means wlsunset).
 - **Per-theme icon overrides** / more icon packs (ROADMAP § Icon themes).
 - **MIPI/IPU software-ISP camera** support (no-UVC machines).
-- **Auto-timezone Waybar tooltip** showing the detected zone (optional).
 - **VPN exit-node richer display** (country/city) (optional).
 - **NixOS release bump → v2** `[human]`: deliberate, hand-edited, never
   automated; the previous attempt was discarded (2026-06-22) over a
diff --git a/agent/HARDWARE-QUEUE.md b/agent/HARDWARE-QUEUE.md
index 0d240d4..bfd8a4f 100644
--- a/agent/HARDWARE-QUEUE.md
+++ b/agent/HARDWARE-QUEUE.md
@@ -167,6 +167,10 @@ QA machine), the **T14s** (webcam case).
       (tooltips, fastfetch labels) is visible on summer-day +
       flexoki-light, kanagawa floats are lighter than the bg (upstream
       sumiInk4). Anything that reads worse than before → reopen 28b.
+- [ ] **Clock zone tooltip (LATER item)** — hover the bar clock: the
+      tooltip's first line shows the zone ("BST (UTC+0100)") above the
+      calendar, on the generated AND summer bars; with auto-timezone
+      on, a zone change updates it (the SIGUSR2 reload).
 - [ ] **Doctor bar tripwire (LATER item)** — with everything healthy
       the bar shows nothing; `systemctl --user start doomed`-style
       induced failure → within ~5 min a red  appears (tooltip lists
diff --git a/agent/JOURNAL.md b/agent/JOURNAL.md
index 7a91c4e..f10b6cd 100644
--- a/agent/JOURNAL.md
+++ b/agent/JOURNAL.md
@@ -17,6 +17,23 @@ Template:
 
 ---
 
+## 2026-07-05 — clock zone tooltip (iteration #43, LATER item)
+- **Task:** LATER › auto-timezone Waybar tooltip. Bullet deleted.
+- **Did:** the clock tooltip's first line is now the zone —
+  `{:%Z (UTC%z)}` above the calendar — in the generated bar AND both
+  summer whole-swaps (parity). Under auto-timezone the existing
+  tz-watch SIGUSR2 reload keeps it current, so it shows the detected
+  zone live. (%Z abbreviation, not the IANA name — strftime has no
+  code for that; good enough for an "(optional)" nicety.)
+- **Verified:** V0; V1 — rendered generated config carries the new
+  tooltip-format; both summer jsonc parse (jq) with %Z present.
+  Hover render → V3 queued.
+- **Pending:** V3. LATER now holds only deferred/big/hw/human items.
+- **Next suggestion:** a QA sweep, or stop-and-wait — the queue is
+  effectively drained for unattended work; meaty LATER items
+  (wallpapers split is *deferred by decision*, installer round 2
+  [big]) deserve Bernardo's go-ahead or a fresh session.
+
 ## 2026-07-05 — doctor bar tripwire (iteration #42, LATER item)
 - **Task:** LATER › doctor Waybar warning. Bullet deleted.
 - **Did:** nomarchy-doctor-status (named bin, PATH): silent exit 0
diff --git a/modules/home/waybar.nix b/modules/home/waybar.nix
index aa5c130..39ae12d 100644
--- a/modules/home/waybar.nix
+++ b/modules/home/waybar.nix
@@ -150,7 +150,9 @@ let
     clock = {
       format = "{:%H:%M}";
       format-alt = "{:%A %d %B %Y}";
-      tooltip-format = "<tt><small>{calendar}</small></tt>";
+      # Zone line first (LATER nicety): under auto-timezone the tz-watch
+      # SIGUSR2 reload keeps it showing the currently *detected* zone.
+      tooltip-format = "{:%Z (UTC%z)}\n<tt><small>{calendar}</small></tt>";
     };
 
     # Active keyboard layout (per focused device) — only placed in
diff --git a/themes/summer-day/waybar.jsonc b/themes/summer-day/waybar.jsonc
index 490dc61..8e8188a 100644
--- a/themes/summer-day/waybar.jsonc
+++ b/themes/summer-day/waybar.jsonc
@@ -70,7 +70,7 @@
   "clock": {
     "format": " {:%H:%M}",
     "tooltip": true,
-    "tooltip-format": "<tt><small>{calendar}</small></tt>"
+    "tooltip-format": "{:%Z (UTC%z)}\n<tt><small>{calendar}</small></tt>"
   },
 
   "clock#date": {
diff --git a/themes/summer-night/waybar.jsonc b/themes/summer-night/waybar.jsonc
index 272a34c..76796dc 100644
--- a/themes/summer-night/waybar.jsonc
+++ b/themes/summer-night/waybar.jsonc
@@ -69,7 +69,7 @@
   "clock": {
     "format": " {:%H:%M}",
     "tooltip": true,
-    "tooltip-format": "<tt><small>{calendar}</small></tt>"
+    "tooltip-format": "{:%Z (UTC%z)}\n<tt><small>{calendar}</small></tt>"
   },
 
   "clock#date": {