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ts/util/getMessageAge.std.ts

@@ -0,0 +1,12 @@
+// Copyright 2026 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { ReadonlyMessageAttributesType } from '../model-types.d.ts';
+
+export function getMessageAge(
+  now: number,
+  message: Pick<ReadonlyMessageAttributesType, 'serverTimestamp' | 'sent_at'>
+): number {
+  const messageTimestamp = message.serverTimestamp ?? message.sent_at ?? 0;
+  return Math.abs(now - messageTimestamp);
+}