diff --git a/doc/lib/js/publish.md b/doc/lib/js/publish.md
index 4da8ae931a..6c9c1dd0c5 100644
--- a/doc/lib/js/publish.md
+++ b/doc/lib/js/publish.md
@@ -59,6 +59,16 @@ clock when they flush frames. Catalog jitter is the spread above each
 rendition's own recent minimum lateness, so a constant encoder delay is not jitter.
 The advertised value only rises; frame duration alone does not set it.
 
+## Clock
+
+Every timestamp the publisher writes is `performance.now()` in microseconds,
+so camera, microphone, screen, and file sources share one timeline. The catalog
+advertises that mapping as its root `clock` from the first snapshot, with PTS
+zero at `performance.timeOrigin`, so a viewer or an HLS export can name any
+frame's wall time. The mapping is fixed for the page: a system-clock
+adjustment never retimes the broadcast. Stamp your own tracks (e.g. text cues)
+on the same timeline to stay in sync.
+
 ## Custom tracks
 
 `broadcast.net` is the underlying `Moq.Broadcast.Producer`, so an application
diff --git a/js/publish/src/broadcast.ts b/js/publish/src/broadcast.ts
index 1ed9f1fc66..465e221dd7 100644
--- a/js/publish/src/broadcast.ts
+++ b/js/publish/src/broadcast.ts
@@ -111,7 +111,8 @@ export class Broadcast {
 	 *
 	 * Set the returned rendition's `config` to a {@link Catalog.TextConfig}, then write one cue per
 	 * group into its `track` with `Hang.Container.Legacy.Producer` (each cue is a keyframe, so it opens
-	 * its own group). See the module docs for the cue framing.
+	 * its own group). See the module docs for the cue framing. Stamp cues with `performance.now()` in
+	 * microseconds, the broadcast clock the catalog advertises.
 	 */
 	text(name: string): Rendition<Catalog.TextConfig> {
 		return this.#register<Catalog.TextConfig>(name, "text");
diff --git a/js/publish/src/catalog.test.ts b/js/publish/src/catalog.test.ts
index 9a0294afc4..58873544ec 100644
--- a/js/publish/src/catalog.test.ts
+++ b/js/publish/src/catalog.test.ts
@@ -45,7 +45,7 @@ test("catalog producer publishes every update as a snapshot group", async () =>
 
 	const first = await subscriber.nextGroup();
 	expect(first?.sequence).toBe(0);
-	expect(await first?.readJson()).toEqual({ video: { renditions: {} } });
+	expect(await first?.readJson()).toEqual({ clock: expect.anything(), video: { renditions: {} } });
 	expect(first?.done).toBe(true);
 
 	catalog.mutate((c) => {
@@ -54,12 +54,46 @@ test("catalog producer publishes every update as a snapshot group", async () =>
 
 	const second = await subscriber.nextGroup();
 	expect(second?.sequence).toBe(1);
-	expect(await second?.readJson()).toEqual({ video: { renditions: {} }, scte35: { splices: [] } });
+	expect(await second?.readJson()).toEqual({
+		clock: expect.anything(),
+		video: { renditions: {} },
+		scte35: { splices: [] },
+	});
 	expect(second?.done).toBe(true);
 
 	effect.close();
 });
 
+test("catalog producer advertises the page clock from the first snapshot", async () => {
+	const catalog = new CatalogProducer();
+
+	const effect = new Effect();
+	const track = new Track.Producer("catalog.json");
+	catalog.serve(track, effect);
+	const consumer = new Json.Snapshot.Consumer<Catalog.Root>({ track: track.subscribe() });
+
+	// Before any rendition: a live-only publisher exposes its clock without an archive.
+	const first = Catalog.RootSchema.parse(await consumer.next());
+	if (!first.clock) throw new Error("expected a root clock");
+	expect(first.archive).toBeUndefined();
+	expect(first.clock.timescale).toBe(1_000_000);
+
+	// A timestamp stamped the way capture does (performance.now() in microseconds) maps onto the
+	// page's own wall timeline, not Date.now(), which a system-clock adjustment can move.
+	const now = performance.now();
+	const wall = Catalog.wallClockTime(first.clock, Math.round(now * 1000), 1_000_000).getTime();
+	expect(Math.abs(wall - (performance.timeOrigin + now))).toBeLessThanOrEqual(1);
+
+	// Later edits keep the mapping: it is fixed for the broadcast.
+	catalog.mutate((c) => {
+		c.video = { renditions: {} };
+	});
+	const second = Catalog.RootSchema.parse(await consumer.next());
+	expect(second.clock).toEqual(first.clock);
+
+	effect.close();
+});
+
 test("a reconnecting subscriber is seeded with the full current catalog", async () => {
 	const catalog = new CatalogProducer();
 	catalog.mutate((c) => {
@@ -105,7 +139,8 @@ test("catalog producer refuses zero jitter before retaining an edit", () => {
 		).toThrow("omit jitter");
 	}
 	catalog.mutate((value) => {
-		expect(value).toEqual({});
+		expect(value.audio).toBeUndefined();
+		expect(value.video).toBeUndefined();
 	});
 });
 
diff --git a/js/publish/src/catalog.ts b/js/publish/src/catalog.ts
index 1c37d4f72d..7c45ec7962 100644
--- a/js/publish/src/catalog.ts
+++ b/js/publish/src/catalog.ts
@@ -1,4 +1,4 @@
-import type * as Catalog from "@moq/hang/catalog";
+import * as Catalog from "@moq/hang/catalog";
 import * as Json from "@moq/json";
 import type * as Moq from "@moq/net";
 import type { Effect } from "@moq/signals";
@@ -11,9 +11,13 @@ import type { Effect } from "@moq/signals";
  * current catalog before receiving updates. Independent owners (the base `video`/`audio` and an
  * application's own sections, e.g. `scte35`) each edit only their own keys, so their sections
  * compose instead of clobbering one another.
+ *
+ * The root `clock` is advertised from the first snapshot: every js/publish timestamp is
+ * `performance.now()` in microseconds, so PTS zero is `performance.timeOrigin`. The mapping is fixed
+ * for the page, so a system-clock adjustment never retimes the broadcast.
  */
 export class CatalogProducer {
-	#value: Catalog.Root = {};
+	#value: Catalog.Root = { clock: pageClock() };
 	#outputs = new Set<Json.Snapshot.Producer<Catalog.Root>>();
 
 	/** Edit the catalog in place; the result is published to all current subscribers. */
@@ -54,3 +58,9 @@ export class CatalogProducer {
 		});
 	}
 }
+
+// The wall time of `performance.now() === 0`, the zero every js/publish timestamp counts from.
+function pageClock(): Catalog.Clock {
+	const wall = Math.round((performance.timeOrigin - Catalog.MOQ_EPOCH_UNIX_MILLIS) * 1000);
+	return { wall: Catalog.u53(wall), timescale: 1_000_000 };
+}
diff --git a/quest/m1/2278-watch-absolute-wall-clock-latency-target-for-synchronized.md b/quest/m1/2278-watch-absolute-wall-clock-latency-target-for-synchronized.md
index 5eaff2b733..80800d1b8a 100644
--- a/quest/m1/2278-watch-absolute-wall-clock-latency-target-for-synchronized.md
+++ b/quest/m1/2278-watch-absolute-wall-clock-latency-target-for-synchronized.md
@@ -30,7 +30,7 @@ a live-only broadcast with no archive timeline.
 
 ## Required
 
-- [Publisher clocks](/quest/m1/publisher-clock.md) - built-in publishers populate the mapping applications read
+- [CLI import clock](/quest/m1/cli-import-clock.md) - built-in publishers populate the mapping applications read
 
 ## Closes
 
diff --git a/quest/m1/README.md b/quest/m1/README.md
index 6f8b01252c..620769e929 100644
--- a/quest/m1/README.md
+++ b/quest/m1/README.md
@@ -33,7 +33,8 @@ transport, benchmark tooling); worktrees isolate commits, not semantics.
 - [Data sections](/quest/m1/data-sections.md) - an application lists JSON and binary tracks in its own catalog section with its own per-track fields, published in one moq-mux call; data entries gain `bitrate` and `jitter`
 - [Broadcast close](/quest/m1/broadcast-close/README.md) - `close()` is the one way to end a broadcast in every language, a permanent retraction that leaves in-flight tracks alone
 - [Relay peer set](/quest/m1/relay-peer-set.md) - a wire consumer tells a client hop from a peer hop, and every mesh credential can mark a peer
-- [Publisher clocks](/quest/m1/publisher-clock.md) - wire the shared clock through native and browser publisher restarts
+- [CLI import clock](/quest/m1/cli-import-clock.md) - fMP4, TS, and FLV imports publish on the shared broadcast clock across restarts
+- [Native clock fixtures](/quest/m1/native-clock-fixtures.md) - CI drives native capture through clock edge cases and asserts the published timestamps
 - [CLI inspection](/quest/m1/cli-inspect/README.md) - `moq ls` lists what is live and `moq fetch` reads a group over MoQ, and a guide shows how to inspect a relay
 - [JS caught up](/quest/m1/js-announce-caught-up.md) - @moq/net's announce consumer says when the initial set has landed, like Rust
 - [Bindings caught up](/quest/m1/announce-live-bindings.md) - moq-ffi, libmoq, and every wrapper yield the same flat announce event, `Live` included
diff --git a/quest/m1/cli-import-clock.md b/quest/m1/cli-import-clock.md
new file mode 100644
index 0000000000..ccdf7f764b
--- /dev/null
+++ b/quest/m1/cli-import-clock.md
@@ -0,0 +1,34 @@
+# [M] CLI imports publish on the broadcast clock
+
+## Goal
+
+`moq import` of fMP4, TS, and FLV publishes timestamps on the shared broadcast
+clock, like native capture and `js/publish` already do, including source
+restarts, late first frames, and real idle gaps. Today the imports publish
+source PTS verbatim against a wall clock sampled at startup, so a TS feed with
+a large starting PTS or a late first frame advertises the wrong wall time.
+
+## Plan
+
+Use `moq_mux::Clock` and `SourceMap` with the root catalog `clock`; this adds
+no clock API or catalog field. Select each source's initial mapping once,
+account for a delayed first frame, and translate source resets onto the same
+monotonic clock while preserving real idle gaps. System-wall adjustments do not
+retime a running broadcast or old archive records. Preserve allowed B-frame
+ordering within a group.
+
+- fMP4 is passthrough, so translation must rewrite `tfdt`.
+- A muxed source needs one mapping for all of its tracks, since interleaved
+  audio and video can step back further than `SourceMap::MAX_REORDER`.
+- Keep conversion at the adapter boundary and refuse an unmappable source
+  explicitly. Discontinuity markers signal the existing playhead contract;
+  they do not replace the wall epoch.
+
+CI fixtures drive the import path, not only the clock helper: simultaneous
+A/V, a late first frame, a restart to zero, a restart after idle, and retained
+archive playback. Update the import docs.
+
+## Related
+
+- [Native clock fixtures](/quest/m1/native-clock-fixtures.md) - the same scenarios through native capture
+- [GStreamer clock](/quest/m1/3021-moq-gst-anchor-generated-media-timelines-to-wall-clock.md) - separate source adapter
diff --git a/quest/m1/native-clock-fixtures.md b/quest/m1/native-clock-fixtures.md
new file mode 100644
index 0000000000..88b158e028
--- /dev/null
+++ b/quest/m1/native-clock-fixtures.md
@@ -0,0 +1,19 @@
+# [S] Native capture proves the broadcast clock in CI
+
+## Goal
+
+Per-PR CI drives the native video and audio capture publishers through clock
+edge cases and asserts the published timestamps: simultaneous A/V, a late
+first frame, a restart to zero, a restart after idle, a system-wall
+adjustment, and retained archive playback. Anything they catch is fixed here.
+
+## Plan
+
+Native video already maps the device timeline onto `catalog.clock()` at open,
+and native audio stamps arrival on it. The fixtures exercise publisher
+integration with a synthetic device source and an injected clock, rather than
+only the clock helper. No new clock API or catalog representation.
+
+## Related
+
+- [CLI import clock](/quest/m1/cli-import-clock.md) - the same scenarios through `moq import`
diff --git a/quest/m1/publisher-clock.md b/quest/m1/publisher-clock.md
deleted file mode 100644
index 23f437f7c9..0000000000
--- a/quest/m1/publisher-clock.md
+++ /dev/null
@@ -1,33 +0,0 @@
-# [L] Use the broadcast clock across media publishers
-
-## Goal
-
-Native video/audio capture, CLI imports, and `js/publish` publish timestamps
-against the shared broadcast clock, including source and encoder restarts.
-A live-only publisher exposes its clock without constructing an archive.
-
-## Plan
-
-Use the dev clock owner and catalog schema. Select each source's initial mapping
-once, account for delayed first frames, and translate source resets onto the
-same monotonic clock while preserving real idle gaps. Share the clock between
-audio and video. System-wall adjustments do not retime a running broadcast or
-old archive records. Preserve allowed B-frame ordering within a group.
-
-Keep source-specific timestamp conversion at the adapter boundary. Refuse an
-unmappable source explicitly. Discontinuity markers signal the existing
-playhead contract; they do not replace the wall epoch. In `js/publish`, the
-video encoder marks a break through `Container.Legacy.Producer.cut()` whenever
-its encode loop stops (demand gap or capture swap). The audio encoder writes its
-own marker on a demand gap only: an audio pipeline rebuild and the framer's
-input-gap reset still write none.
-
-Add CI fixtures for simultaneous A/V, late first frames, restart to zero,
-restart after idle, system-wall adjustment, and retained archive playback.
-The fixtures must exercise publisher integration rather than only the clock
-helper. Update publisher and import docs; this quest adds no new clock API or
-catalog representation. GStreamer's clock observation remains its own quest.
-
-## Related
-
-- [GStreamer clock](/quest/m1/3021-moq-gst-anchor-generated-media-timelines-to-wall-clock.md) - separate source adapter
diff --git a/quest/m2/teleop/correlation.md b/quest/m2/teleop/correlation.md
index 7a0c44f451..779d6f6e07 100644
--- a/quest/m2/teleop/correlation.md
+++ b/quest/m2/teleop/correlation.md
@@ -30,4 +30,4 @@ the same property that makes an MCAP recording valuable.
 ## Required
 
 - [Robot teleoperation primitive](/quest/m2/teleop/robot.md)
-- [Publisher clocks](/quest/m1/publisher-clock.md) - publishers populate the fixed broadcast mapping used to join tracks
+- [CLI import clock](/quest/m1/cli-import-clock.md) - publishers populate the fixed broadcast mapping used to join tracks