diff --git a/check_nodes.go b/check_nodes.go
index 347b374..65cc850 100644
--- a/check_nodes.go
+++ b/check_nodes.go
@@ -40,11 +40,11 @@ func sendEmailAbo(username string, alias string, deveui string, days_left int, l
 	}
 	mail_message := "To: " + username + `
 From: info@wo-bisch.ch
-Subject: ` + level + ` - wo-bisch.ch: Abo laeuft ab (` + alias + `)
+Subject: ` + level + ` - wo-bisch.ch: Abo verlaengern (` + alias + `)
 
 Lieber Benutzer von wo-bisch.ch
 
-` + ablauftext + `Das Abo von "` + alias + `" (DevEUI: ` + deveui + `) laeuft in ` + strconv.Itoa(days_left) + ` Tagen ab.
+` + ablauftext + `
 
 Bitte Abo verlaengern auf https://wo-bisch.ch
 
@@ -117,6 +117,14 @@ func checkNodes() {
 }
 
 func checkNodesHandler(w http.ResponseWriter, req *http.Request) {
-	checkNodes()
+	headers := req.Header
+
+	val, ok := headers["X-Checknodes"]
+	if ok {
+		fmt.Printf("X-Checknodes header is present with value %s\n", val)
+		checkNodes()
+	} else {
+		fmt.Println("X-Checknodes header is not present")
+	}
 	w.WriteHeader(http.StatusOK)
 }
diff --git a/metrics.go b/metrics.go
index 282c04e..2d0923d 100644
--- a/metrics.go
+++ b/metrics.go
@@ -7,6 +7,7 @@ import (
 	"html/template"
 	"io/ioutil"
 	"log"
+	"math"
 	"net/http"
 	"os"
 	"strconv"
@@ -402,7 +403,7 @@ func CalcDaysUntil(mydate string) int {
 	if err != nil {
 		days = 0
 	}
-	days = int(t.Sub(time.Now()).Hours() / 24)
+	days = int(math.Round((t.Sub(time.Now()).Hours() / 24) + 0.5))
 
 	return days
 }