diff --git a/scripts/content.js b/scripts/content.js
index bdfb658..6e72c94 100644
--- a/scripts/content.js
+++ b/scripts/content.js
@@ -382,6 +382,17 @@ async function runner() {
         return;
     }
 
+    // Check if current time is between 11pm and 9am UTC (4pm - 2am PST)
+    let now = new Date();
+    let currentHourUTC = now.getUTCHours();
+    if (currentHourUTC >= 23 || currentHourUTC < 9) {
+        // Continue running the code
+    } else {
+        await chrome.storage.local.set({ "ctx_statusMsg": "not operational hours" });
+        isRunning = false;
+        return;
+    }
+
     if (isFoundAppointment) {
         // don't do anything if appointment is found and manual booking is required
         if (isAppointmentPage()) {