diff --git a/client/client.go b/client/client.go
index 5440739..29b1f11 100644
--- a/client/client.go
+++ b/client/client.go
@@ -60,6 +60,33 @@ func Label(port int, names ...string) ([]window.Schedule, error) {
 	return readSchedules(urls)
 }
 
+// ActiveHours gets the built-in Active Hours maintenance window.
+func ActiveHours(port int) (*window.Window, error) {
+	if !Test(fmt.Sprintf("%s:%d", urlBase, port)) {
+		return nil, fmt.Errorf("service not available")
+	}
+	url := fmt.Sprintf("%s:%d/active_hours", urlBase, port)
+	var win *window.Window
+	response, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return win, fmt.Errorf(
+			"active_hours request failed for url %s (%d)", url, response.StatusCode)
+	}
+	j, err := io.ReadAll(response.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := json.Unmarshal(j, win); err != nil {
+		return nil, err
+	}
+	return win, nil
+}
+
 func readSchedules(urls []string) ([]window.Schedule, error) {
 	var sched []window.Schedule
 	for _, url := range urls {
diff --git a/schedule/schedule.go b/schedule/schedule.go
index 2ab1285..522a9e7 100644
--- a/schedule/schedule.go
+++ b/schedule/schedule.go
@@ -17,7 +17,6 @@ package schedule
 
 import (
 	"fmt"
-	"runtime"
 	"strings"
 	"time"
 
@@ -60,6 +59,11 @@ func findNearest(schedules []window.Schedule) window.Schedule {
 	return next
 }
 
+// ActiveHours returns the built-in Active Hours maintenance window.
+func ActiveHours() (*window.Window, error) {
+	return window.ActiveHoursWindow()
+}
+
 // Schedule calculates schedule per label and returns label whose names match the given string(s).
 func Schedule(names ...string) ([]window.Schedule, error) {
 	var r window.Reader
@@ -67,13 +71,6 @@ func Schedule(names ...string) ([]window.Schedule, error) {
 	if err != nil {
 		return nil, err
 	}
-	switch runtime.GOOS {
-	case "windows":
-		m, err = window.ActiveHoursWindow(m)
-		if err != nil {
-			return nil, err
-		}
-	}
 	if len(names) == 0 {
 		names = m.Keys()
 	}
diff --git a/server/server.go b/server/server.go
index 921fd52..0c0647d 100644
--- a/server/server.go
+++ b/server/server.go
@@ -53,6 +53,18 @@ func serve(w http.ResponseWriter, r *http.Request) {
 	sendHTTPResponse(w, http.StatusOK, b)
 }
 
+func serveActiveHours(w http.ResponseWriter, r *http.Request) {
+	s, err := schedule.ActiveHours()
+	if err != nil {
+		sendHTTPResponse(w, http.StatusInternalServerError, []byte(err.Error()))
+	}
+	b, err := json.Marshal(&s)
+	if err != nil {
+		sendHTTPResponse(w, http.StatusInternalServerError, []byte(err.Error()))
+	}
+	sendHTTPResponse(w, http.StatusOK, b)
+}
+
 func respondOk(w http.ResponseWriter, r *http.Request) {
 	sendHTTPResponse(w, http.StatusOK, []byte("OK"))
 }
@@ -62,6 +74,7 @@ func muxRouter() http.Handler {
 	rtr.HandleFunc("/status", respondOk)
 	rtr.HandleFunc("/schedule", serve)
 	rtr.HandleFunc("/schedule/{label}", serve)
+	rtr.HandleFunc("/active_hours", serveActiveHours)
 	return rtr
 }
 
diff --git a/window/window.go b/window/window.go
index 0584810..ae5a0eb 100644
--- a/window/window.go
+++ b/window/window.go
@@ -579,7 +579,7 @@ func reportConfFileMetric(path, result string) {
 }
 
 // ActiveHoursWindow retrieves the built-in Active Hours maintenance windows if available.
-func ActiveHoursWindow(m Map) (Map, error) {
+func ActiveHoursWindow() (*Window, error) {
 	activeStartTime, activeEndTime, err := auklib.ActiveHours()
 	if err != nil {
 		return nil, err
@@ -602,6 +602,5 @@ func ActiveHoursWindow(m Map) (Map, error) {
 	} else {
 		activeWindow.Schedule.State = "closed"
 	}
-	m.Add(activeWindow)
-	return m, nil
+	return &activeWindow, nil
 }