diff --git a/packages/api-websockets/src/features/ListConnections/ListConnectionsUseCase.ts b/packages/api-websockets/src/features/ListConnections/ListConnectionsUseCase.ts
index 3f4a740168b..0f3d93d08c5 100644
--- a/packages/api-websockets/src/features/ListConnections/ListConnectionsUseCase.ts
+++ b/packages/api-websockets/src/features/ListConnections/ListConnectionsUseCase.ts
@@ -4,6 +4,36 @@ import type { WebsocketsError } from "~/features/shared/errors.js";
 import { WebsocketServiceError } from "~/features/shared/errors.js";
 import { ConnectionRegistry } from "~/features/ConnectionRegistry/abstractions.js";
 
+const RECENT_CONNECTION_WINDOW_MS = 3 * 60 * 60 * 1000;
+
+/**
+ * Parse a stored `connectedOn` value to a UTC epoch (ms).
+ *
+ * `connectedOn` is written as a UTC ISO string, but SQL `datetime` columns hand it back in a
+ * driver-specific shape: a `Date` object (mysql2) or a `T`/`Z`-less string like "2026-08-04 17:02:06".
+ * We normalize the string form back to UTC (safe — the stored wall-clock is UTC) so recency checks
+ * don't depend on the driver's formatting. Returns NaN for anything unparseable.
+ */
+const connectedOnToEpoch = (value: unknown): number => {
+    if (value instanceof Date) {
+        return value.getTime();
+    }
+    if (typeof value === "string") {
+        const normalized =
+            value.includes(" ") && !value.includes("T") ? `${value.replace(" ", "T")}Z` : value;
+        return new Date(normalized).getTime();
+    }
+    return NaN;
+};
+
+const isRecentConnection = (
+    connection: WebsocketsListConnectionsUseCase.RegistryData,
+    cutoff: number
+): boolean => {
+    const epoch = connectedOnToEpoch(connection.connectedOn);
+    return Number.isFinite(epoch) && epoch >= cutoff;
+};
+
 class ListConnectionsUseCaseImpl implements WebsocketsListConnectionsUseCase.Interface {
     public constructor(private readonly registry: ConnectionRegistry.Interface) {}
 
@@ -27,8 +57,9 @@ class ListConnectionsUseCaseImpl implements WebsocketsListConnectionsUseCase.Int
             return Result.fail(new WebsocketServiceError(error as Error));
         }
 
-        const threeHoursAgo = new Date(Date.now() - 3 * 60 * 60 * 1000).toISOString();
-        connections = connections.filter(c => c.connectedOn >= threeHoursAgo);
+        // Keep only connections seen within the recency window.
+        const cutoff = Date.now() - RECENT_CONNECTION_WINDOW_MS;
+        connections = connections.filter(c => isRecentConnection(c, cutoff));
 
         return Result.ok(connections);
     }