diff --git a/src/infra/heartbeat-active-hours.ts b/src/infra/heartbeat-active-hours.ts
index 1d9f1d3362d..91341b69a8b 100644
--- a/src/infra/heartbeat-active-hours.ts
+++ b/src/infra/heartbeat-active-hours.ts
@@ -4,7 +4,7 @@ import type { AgentDefaultsConfig } from "../config/types.agent-defaults.js";
 
 type HeartbeatConfig = AgentDefaultsConfig["heartbeat"];
 
-const ACTIVE_HOURS_TIME_PATTERN = /^([01]\d|2[0-3]|24):([0-5]\d)$/;
+const ACTIVE_HOURS_TIME_PATTERN = /^(?:([01]\d|2[0-3]):([0-5]\d)|24:00)$/;
 
 function resolveActiveHoursTimezone(cfg: OpenClawConfig, raw?: string): string {
   const trimmed = raw?.trim();