[AI-assisted] fix(dreaming): use host local timezone for diary timestamps (#65034)

* fix(dreaming): use host local timezone when timezone is not configured

When `memory.dreaming.timezone` is unset, `formatNarrativeDate()`
previously defaulted to UTC, causing diary timestamps in DREAMS.md and
the Control UI to display UTC time as though it were the user's local
time. For example, a PDT user seeing 9:46 PM instead of the correct
2:46 PM.

Drop the UTC fallback so `Intl.DateTimeFormat` automatically uses the
host's timezone when no explicit timezone is provided. Users who have
set `agents.defaults.userTimezone` or `dreaming.timezone` are
unaffected.

Fixes #65027

* docs(changelog): add dreaming timezone entry

* Update CHANGELOG.md

---------

Co-authored-by: Vincent Koc <vincentkoc@ieee.org>

CHANGELOG.md

@@ -16,6 +16,7 @@ Docs: https://docs.openclaw.ai
 - Agents/Anthropic replay: preserve immutable signed-thinking replay safety across stored and live reruns, keep non-thinking embedded `tool_result` user blocks intact, and drop conflicting preserved tool IDs before validation so retries stop degrading into omitted tool calls. (#65126) Thanks @shakkernerd.
 - Telegram/direct sessions: keep commentary-only assistant fallback payloads out of visible direct delivery, so Codex planning chatter cannot leak into Telegram DMs when a run has no `final_answer` text. (#65112) Thanks @vincentkoc.
 - Infra/net: fix multipart FormData fields (including `model`) being silently dropped when a guarded runtime fetch body crosses a FormData implementation boundary, restoring OpenAI audio transcription requests that failed with HTTP 400. (#64349) Thanks @petr-sloup.
+- Dreaming/diary: use the host local timezone for diary timestamps when `dreaming.timezone` is unset, so `DREAMS.md` and the UI stop defaulting to UTC. (#65034) Thanks @neo1027144-creator and @vincentkoc.
 - Plugins/memory: restore cached memory capability public artifacts on plugin-registry cache hits so memory-backed artifact surfaces stay visible after warm loads. Thanks @sercada and @vincentkoc.
 - Gateway/cron: preserve requested isolated-agent config across runtime reloads so subagent jobs and heartbeat overrides keep the right workspace and heartbeat settings when the hot-loaded snapshot is stale. Thanks @l0cka and @vincentkoc.
 - Cron/isolated sessions: persist the right transcript path for each isolated run, including fresh session rollovers, so cron runs stop appending to stale session files. Thanks @samrusani and @vincentkoc.

extensions/memory-core/src/dreaming-narrative.test.ts

@@ -122,6 +122,36 @@ describe("formatNarrativeDate", () => {
     expect(date).toContain("2026");
     expect(date).toContain("3:00");
   });
+
+  it("applies an explicit timezone", () => {
+    // 2026-04-11T21:46:55Z in America/Los_Angeles (PDT, UTC-7) → 2:46 PM
+    const date = formatNarrativeDate(
+      Date.parse("2026-04-11T21:46:55Z"),
+      "America/Los_Angeles",
+    );
+    expect(date).toContain("2:46");
+    expect(date).toContain("PM");
+  });
+
+  it("uses host local timezone when timezone is undefined (#65027)", () => {
+    // Force a non-UTC host timezone so this test is meaningful on UTC CI
+    // runners where the old `?? "UTC"` fallback would silently pass.
+    const originalTZ = process.env.TZ;
+    try {
+      process.env.TZ = "America/Los_Angeles"; // PDT = UTC-7
+      const epochMs = Date.parse("2026-04-11T21:46:55Z");
+      const result = formatNarrativeDate(epochMs);
+      // 21:46 UTC → 14:46 PDT → "2:46 PM"
+      expect(result).toContain("2:46");
+      expect(result).toContain("PM");
+    } finally {
+      if (originalTZ === undefined) {
+        delete process.env.TZ;
+      } else {
+        process.env.TZ = originalTZ;
+      }
+    }
+  });
 });
 
 describe("buildDiaryEntry", () => {

extensions/memory-core/src/dreaming-narrative.ts

@@ -231,7 +231,7 @@ export function extractNarrativeText(messages: unknown[]): string | null {
 
 export function formatNarrativeDate(epochMs: number, timezone?: string): string {
   const opts: Intl.DateTimeFormatOptions = {
-    timeZone: timezone ?? "UTC",
+    timeZone: timezone,
     year: "numeric",
     month: "long",
     day: "numeric",