diff --git a/CHANGELOG.md b/CHANGELOG.md
index deaf154..b735745 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@
 
 ### Fixed
 
+- Format the current time in Claude response prompts in UTC regardless of the host timezone.
 - Bound recent live Discord context passed to Claude so deep-context requests cannot contribute unbounded live-message input.
 - Support announcement and other guild text-based channels in MCP channel tools.
 - Reject symbolic-link attachment destinations instead of following them when saving downloads.
diff --git a/src/askClaude.ts b/src/askClaude.ts
index 41ad01d..5d28b26 100644
--- a/src/askClaude.ts
+++ b/src/askClaude.ts
@@ -46,6 +46,7 @@ export async function askClaude(
     const now = new Date();
     promptParts.push(
         `=== Current time: ${now.toLocaleString("en-US", {
+            timeZone: "UTC",
             weekday: "long",
             year: "numeric",
             month: "long",
diff --git a/tests/promptTime.test.mjs b/tests/promptTime.test.mjs
new file mode 100644
index 0000000..e5adc4e
--- /dev/null
+++ b/tests/promptTime.test.mjs
@@ -0,0 +1,48 @@
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { spawnSync } from "node:child_process";
+import test from "node:test";
+import { fileURLToPath } from "node:url";
+
+const repoDir = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+
+test("formats Claude response prompt times in UTC", () => {
+    const messagesDir = fs.mkdtempSync(
+        path.join(os.tmpdir(), "claudify-prompt-time-"),
+    );
+    try {
+        const script = `
+            import { askClaude } from "./build/askClaude.js";
+            let prompt = "";
+            await askClaude(
+                "Question", "User", "user-1", "general", "channel-1",
+                "Guild", "guild-1", [], "",
+                async (_args, input) => {
+                    prompt = input;
+                    return { stdout: "Answer", stderr: "" };
+                },
+            );
+            process.stdout.write(prompt.split("\\n", 1)[0]);
+        `;
+        const result = spawnSync(
+            process.execPath,
+            ["--input-type=module", "--eval", script],
+            {
+                cwd: repoDir,
+                encoding: "utf8",
+                env: {
+                    ...process.env,
+                    MESSAGES_DIR: messagesDir,
+                    TZ: "America/Los_Angeles",
+                },
+            },
+        );
+
+        assert.equal(result.status, 0, result.stderr);
+        assert.match(result.stdout, /^=== Current time: .* UTC ===$/);
+    } finally {
+        fs.rmSync(messagesDir, { recursive: true, force: true });
+    }
+});
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