diff --git a/src/client/components/Colophon.tsx b/src/client/components/Colophon.tsx
index 4a4416e..275dc11 100644
--- a/src/client/components/Colophon.tsx
+++ b/src/client/components/Colophon.tsx
@@ -83,6 +83,20 @@ export const IDEA_CREDITS = [
   },
 ] as const;
 
+/**
+ * Where the daily reset clocks come from.
+ *
+ * Every game's reset hour and server offset in `games.ts` was checked against
+ * Game-Time-Master, which keeps a zone and a reset time for each server of each
+ * game. The values are transcribed facts, not its code — it is GPL-3.0 and
+ * nothing of it ships here — so this is thanks, beside the schedules' sources,
+ * rather than a NOTICE entry.
+ */
+export const RESET_CLOCK_CREDIT = {
+  name: "Game-Time-Master",
+  url: "https://github.com/cicerakes/Game-Time-Master",
+} as const;
+
 /**
  * How many lagging games to name before summarising the rest.
  *
@@ -375,6 +389,18 @@ export function Colophon({
             ))}
             {", whose editors compile and maintain the event calendars this reads from. The schedules are their work; this page only rearranges them."}
           </p>
+          <p className="mt-2">
+            To{" "}
+            <a
+              href={RESET_CLOCK_CREDIT.url}
+              target="_blank"
+              rel="noreferrer noopener"
+              className={LINK}
+            >
+              {RESET_CLOCK_CREDIT.name}
+            </a>
+            , whose per-server reset times set every daily clock here.
+          </p>
           <p className="mt-2">
             And to{" "}
             {studios.map((studio, i) => (
diff --git a/test/custom-ui.test.tsx b/test/custom-ui.test.tsx
index 4a4ad99..187e32f 100644
--- a/test/custom-ui.test.tsx
+++ b/test/custom-ui.test.tsx
@@ -12,7 +12,7 @@ import {
 import { eventCaption, YourOwn } from "../src/client/components/YourOwn.tsx";
 import { EventRow } from "../src/client/components/EventRow.tsx";
 import { EventDetail } from "../src/client/components/EventDetail.tsx";
-import { AUTHOR, Colophon, REPO_URL } from "../src/client/components/Colophon.tsx";
+import { AUTHOR, Colophon, REPO_URL, RESET_CLOCK_CREDIT } from "../src/client/components/Colophon.tsx";
 import { GameMetaProvider } from "../src/client/state/gameMeta.tsx";
 import {
   asDisplayEvent,
@@ -502,6 +502,17 @@ describe("Colophon freshness notice (PRD F7)", () => {
     // muted class as its neighbours, and no ask anywhere in the footer.
     expect(html).not.toMatch(/support me|buy me|donate|tip jar/i);
   });
+
+  test("thanks Game-Time-Master for the reset clocks, beside the sources", () => {
+    // Every daily reset the app counts down to was checked against it, so it is
+    // credited where the schedules' sources are rather than among the ideas.
+    const html = renderToStaticMarkup(<Colophon sources={[fresh]} now={NOW} />);
+    expect(html).toContain(RESET_CLOCK_CREDIT.url);
+    expect(html).toContain(RESET_CLOCK_CREDIT.name);
+    const credit = html.indexOf(RESET_CLOCK_CREDIT.url);
+    expect(credit).toBeGreaterThan(html.indexOf("With thanks to"));
+    expect(credit).toBeLessThan(html.indexOf("Not affiliated"));
+  });
 });
 
 describe("stating a repeat", () => {