diff --git a/web/src/lib/chat/spacetime.svelte.ts b/web/src/lib/chat/spacetime.svelte.ts
index ecf724c..ee9382d 100644
--- a/web/src/lib/chat/spacetime.svelte.ts
+++ b/web/src/lib/chat/spacetime.svelte.ts
@@ -26,9 +26,7 @@ export function createSpacetimeChat(
 	function spacetimeRowToMessage(row: any): MessageData {
 		let createdAt: string;
 		try {
-			const micros = row.createdAt?.microsSinceEpoch;
-			const ms = typeof micros === 'bigint' ? Number(micros / 1000n) : Number(micros) / 1000;
-			createdAt = new Date(ms).toISOString();
+			createdAt = row.createdAt?.toISOString?.() ?? row.createdAt?.toDate?.()?.toISOString() ?? new Date().toISOString();
 		} catch {
 			createdAt = new Date().toISOString();
 		}
@@ -117,8 +115,7 @@ export function createSpacetimeChat(
 
 	function extractMs(ts: any): number {
 		try {
-			const micros = ts?.microsSinceEpoch;
-			return typeof micros === 'bigint' ? Number(micros / 1000n) : Number(micros) / 1000;
+			return ts?.toDate?.()?.getTime() ?? 0;
 		} catch {
 			return 0;
 		}