.changeset/empty-buses-walk.md (1)

1-8: Add explicit BREAKING notes and migration guidance to the changeset.

Major bumps are appropriate. Please expand the body with concrete breaking changes and migration steps (context/type removals, flag removal, i18n key deletions) to help integrators.

Apply this diff to append actionable notes:

 Promotes Timestamp Parser from preview state to stable
+
+BREAKING:
+- @rocket.chat/gazzodown: MarkupInteractionContextValue no longer includes `enableTimestamp`; Timestamp always renders.
+- @rocket.chat/ui-client: Feature flag `enable-timestamp-message-parser` removed from `FeaturesAvailable` and from defaults.
+- @rocket.chat/i18n: Removed keys `Enable_timestamp` and `Enable_timestamp_description`.
+
+MIGRATION:
+- Remove any usage of `enableTimestamp` from Markup providers/consumers.
+- Drop persisted `enable-timestamp-message-parser` entries from user/admin settings payloads if you store custom lists.
+- Replace any i18n references to the removed keys.

packages/gazzodown/src/Markup.stories.tsx (1)

81-107: Add a locale showcase to validate RelativeTime i18n.

Consider an extra story passing language in the context (e.g., 'pt-BR', 'sv') to visually verify formatting.

packages/gazzodown/src/elements/Timestamp/index.tsx (6)

38-42: Always-on rendering: good; ensure radix for parseInt.

Guard against accidental octal/hex by specifying base 10.

-	<ErrorBoundary fallback={<>{new Date(parseInt(children.value.timestamp) * 1000).toUTCString()}</>}>
-		<Timestamp format={children.value.format} value={new Date(parseInt(children.value.timestamp) * 1000)} />
+	<ErrorBoundary fallback={<>{new Date(parseInt(children.value.timestamp, 10) * 1000).toUTCString()}</>}>
+		<Timestamp format={children.value.format} value={new Date(parseInt(children.value.timestamp, 10) * 1000)} />

---

79-91: Language is ignored after the first tick; fix effect to use context language.

The interval callback hardcodes 'en' and language isn’t in deps, so changing language won’t update the text.

-	const { language } = useContext(MarkupInteractionContext);
+	const { language } = useContext(MarkupInteractionContext);
 	const [text, setTime] = useState(() => intlFormatDistance(time, Date.now(), { locale: language ?? 'en' }));
 	const [timeToRefresh, setTimeToRefresh] = useState(() => getTimeToRefresh(time));
 	useEffect(() => {
 		const interval = setInterval(() => {
-			setTime(intlFormatDistance(value.getTime(), Date.now(), { locale: 'en' }));
+			setTime(intlFormatDistance(value.getTime(), Date.now(), { locale: language ?? 'en' }));
 			setTimeToRefresh(getTimeToRefresh(time));
-		}, timeToRefresh);
+		}, timeToRefresh);
 		return () => clearInterval(interval);
-	}, [time, timeToRefresh, value]);
+	}, [time, timeToRefresh, value, language]);

---

95-115: Refresh cadence uses signed delta; use absolute difference to avoid 1s refresh forever.

Past timestamps yield negative deltas, hitting the “< 1 minute” branch indefinitely.

-const getTimeToRefresh = (time: number): number => {
-	const timeToRefresh = time - Date.now();
+const getTimeToRefresh = (time: number): number => {
+	const diff = Math.abs(Date.now() - time);
 	// less than 1 minute
-	if (timeToRefresh < 60000) {
+	if (diff < 60_000) {
 		return 1000;
 	}
 	// if the difference is in the minutes range, we should refresh the time in 1 minute / 2
-	if (timeToRefresh < 3600000) {
-		return 60000 / 2;
+	if (diff < 3_600_000) {
+		return 60_000 / 2;
 	}
 	// if the difference is in the hours range, we should refresh the time in 5 minutes
-	if (timeToRefresh < 86400000) {
-		return 60000 * 5;
+	if (diff < 86_400_000) {
+		return 60_000 * 5;
 	}
 	// refresh the time in 1 hour
-	return 3600000;
+	return 3_600_000;

---

63-73: Optional: Title localization.

title uses browser default. Consider toLocaleString(language) for consistency with inline text.

---

9-11: Nit: Rename prop type.

BoldSpanProps is misleading here; consider TimestampSpanProps.

---

32-34: Nit: Remove JSON.stringify from default branch.

Rendering a raw number JSON is odd; prefer ISO string.

-			return <time dateTime={value.toISOString()}> {JSON.stringify(value.getTime())}</time>;
+			return <time dateTime={value.toISOString()}>{value.toISOString()}</time>;

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