diff --git a/src/agents/openclaw-tools.session-status.test.ts b/src/agents/openclaw-tools.session-status.test.ts
index dd361b70e67..c6e12bb78b6 100644
--- a/src/agents/openclaw-tools.session-status.test.ts
+++ b/src/agents/openclaw-tools.session-status.test.ts
@@ -115,6 +115,33 @@ describe("session_status tool", () => {
     expect(details.statusText).not.toContain("OAuth/token status");
   });
 
+  it("includes ISO-8601 and Unix timestamps for scheduling", async () => {
+    loadSessionStoreMock.mockReset();
+    updateSessionStoreMock.mockReset();
+    loadSessionStoreMock.mockReturnValue({
+      main: {
+        sessionId: "s1",
+        updatedAt: 10,
+      },
+    });
+
+    const tool = createOpenClawTools({ agentSessionKey: "main" }).find(
+      (candidate) => candidate.name === "session_status",
+    );
+    expect(tool).toBeDefined();
+    if (!tool) {
+      throw new Error("missing session_status tool");
+    }
+
+    const result = await tool.execute("call-time", {});
+    const details = result.details as { ok?: boolean; statusText?: string };
+    expect(details.ok).toBe(true);
+    // ISO-8601 format: YYYY-MM-DDTHH:MM:SS.sssZ
+    expect(details.statusText).toMatch(/ISO-8601: \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z/);
+    // Unix timestamp: 10-digit number
+    expect(details.statusText).toMatch(/Unix: \d{10}/);
+  });
+
   it("errors for unknown session keys", async () => {
     resetSessionStore({
       main: { sessionId: "s1", updatedAt: 10 },
diff --git a/src/agents/system-prompt.test.ts b/src/agents/system-prompt.test.ts
index 01cdfb2cc3a..11a9fd5d01b 100644
--- a/src/agents/system-prompt.test.ts
+++ b/src/agents/system-prompt.test.ts
@@ -363,7 +363,7 @@ describe("buildAgentSystemPrompt", () => {
     }
   });
 
-  it("hints to use session_status for current date/time", () => {
+  it("hints to use session_status for current date/time with scheduling formats", () => {
     const prompt = buildAgentSystemPrompt({
       workspaceDir: "/tmp/clawd",
       userTimezone: "America/Chicago",
@@ -371,6 +371,9 @@ describe("buildAgentSystemPrompt", () => {
 
     expect(prompt).toContain("session_status");
     expect(prompt).toContain("current date");
+    expect(prompt).toContain("ISO-8601");
+    expect(prompt).toContain("Unix");
+    expect(prompt).toContain("scheduling");
   });
 
   // The system prompt intentionally does NOT include the current date/time.
diff --git a/src/agents/system-prompt.ts b/src/agents/system-prompt.ts
index 3b3453be6f7..42891ea2be0 100644
--- a/src/agents/system-prompt.ts
+++ b/src/agents/system-prompt.ts
@@ -497,7 +497,7 @@ export function buildAgentSystemPrompt(params: {
       : "",
     params.modelAliasLines && params.modelAliasLines.length > 0 && !isMinimal ? "" : "",
     userTimezone
-      ? "If you need the current date, time, or day of week, run session_status (📊 session_status)."
+      ? "If you need current date, time, or day of week (includes ISO-8601 and Unix for scheduling), run session_status (📊 session_status)."
       : "",
     "## Workspace",
     `Your working directory is: ${displayWorkspaceDir}`,
diff --git a/src/agents/tools/session-status-tool.ts b/src/agents/tools/session-status-tool.ts
index 2277b6e8ad2..8aad6369407 100644
--- a/src/agents/tools/session-status-tool.ts
+++ b/src/agents/tools/session-status-tool.ts
@@ -343,10 +343,13 @@ export function createSessionStatusTool(opts?: {
 
       const userTimezone = resolveUserTimezone(cfg.agents?.defaults?.userTimezone);
       const userTimeFormat = resolveUserTimeFormat(cfg.agents?.defaults?.timeFormat);
-      const userTime = formatUserTime(new Date(), userTimezone, userTimeFormat);
+      const now = new Date();
+      const userTime = formatUserTime(now, userTimezone, userTimeFormat);
+      const iso = now.toISOString();
+      const unix = Math.floor(now.getTime() / 1000);
       const timeLine = userTime
-        ? `🕒 Time: ${userTime} (${userTimezone})`
-        : `🕒 Time zone: ${userTimezone}`;
+        ? `🕒 Time: ${userTime} (${userTimezone})\n   ISO-8601: ${iso} | Unix: ${unix}`
+        : `🕒 Time zone: ${userTimezone}\n   ISO-8601: ${iso} | Unix: ${unix}`;
 
       const agentDefaults = cfg.agents?.defaults ?? {};
       const defaultLabel = `${configured.provider}/${configured.model}`;