make date format correct

app.js

@@ -100,7 +100,7 @@ class App {
     console.log(lieferschein)
     const data = {
       id: lieferschein.cLieferscheinNr,
-      date: sendDate.getDate()+'.'+ (sendDate.getMonth() +1)  +'.'+sendDate.getFullYear(), 
+      date: this.#formatDate(sendDate),
       trackingNr: excelFileData['Sendungs-Nr.'], 
       infos: excelFileData['Lieferschein-Nr.'], 
       returnTrackingNr:''      
@@ -119,6 +119,16 @@ class App {
     csvExport.add(data)
   }
 
+  #formatDate(d) {
+
+    let day =  d.getDate()
+    if (day < 10) day = `0${day}`
+    let month = d.getMonth() + 1
+    if (month < 10) month = `0${month}`
+    let year = d.getFullYear()
+    return day +'.'+ month  +'.'+year
+  }
+
 
 
   async #createLabelData(excelFileData, jtlOrderData, paketData) {