diff --git a/firmware/html/bottom.js b/firmware/html/bottom.js
index af046d3..3eb1997 100644
--- a/firmware/html/bottom.js
+++ b/firmware/html/bottom.js
@@ -557,26 +557,51 @@ function fillTableFromJson() {
 function createJsonFromTable() {
     var tableRows = document.querySelectorAll("table tr");
     var tcdata = [];
+  
+    // Speichert die Zeitangaben (hour, minute) in einem Array
+    var timeArr = [];
     for (var i = 1; i <= 10; i++) {
-
-        var row = document.getElementById("hour" + i).parentNode;
-        var hour = parseInt(row.cells[0].childNodes[0].value);
-        var min = parseInt(row.cells[1].childNodes[0].value);
-        var ch1 = Math.round(parseInt(row.cells[2].childNodes[0].value) * 2.55);
-        var ch2 = Math.round(parseInt(row.cells[3].childNodes[0].value) * 2.55);
-        var ch3 = Math.round(parseInt(row.cells[4].childNodes[0].value) * 2.55);
-        var ch4 = Math.round(parseInt(row.cells[5].childNodes[0].value) * 2.55);
-
-        tcdata.push({hour: hour, min: min, ch1: ch1, ch2: ch2, ch3: ch3, ch4: ch4});
+      var row = document.getElementById("hour" + i).parentNode;
+      var hour = parseInt(row.cells[0].childNodes[0].value);
+      var min = parseInt(row.cells[1].childNodes[0].value);
+      timeArr.push(hour * 60 + min); // Speichert die Zeitangaben als Minuten seit Mitternacht
+      var ch1 = Math.round(parseInt(row.cells[2].childNodes[0].value) * 2.55);
+      var ch2 = Math.round(parseInt(row.cells[3].childNodes[0].value) * 2.55);
+      var ch3 = Math.round(parseInt(row.cells[4].childNodes[0].value) * 2.55);
+      var ch4 = Math.round(parseInt(row.cells[5].childNodes[0].value) * 2.55);
+      tcdata.push({hour: hour, min: min, ch1: ch1, ch2: ch2, ch3: ch3, ch4: ch4});
     }
+  
+    // Überprüft, ob die Zeitangaben von datensatz i=0 bis i=9 aufsteigend sind
+    for (var i = 0; i < timeArr.length - 1; i++) {
+      if (timeArr[i] >= timeArr[i + 1]) {
+        console.log("Fehler: Zeitangaben sind nicht aufsteigend.");
+        return null;
+      }
+    }
+  
     var currentTime = {hour: new Date().getHours(), min: new Date().getMinutes()};
     var jsonData = {tcdata: tcdata, currenttime: currentTime};
     //console.log("jsonData = " + JSON.stringify(jsonData));
     return JSON.stringify(jsonData);
-}
+  }
 
 function sendDataToServer() {
     var jsonData = createJsonFromTable();
+
+    if (!jsonData) {
+        button.classList.remove("pure-button-primary");
+        button.classList.add("error");
+        button.innerHTML = "Error!";
+        setTimeout(function () {
+          button.classList.remove("error");
+          button.classList.add("pure-button-primary");
+          button.innerHTML = "save";
+        }, 2000);
+        console.log('Error while sending data to server.');
+        return;
+    }
+
     var urlEncodedData = encodeURIComponent(jsonData);
     var url = 'http://{{IP_ADDRESS}}/tc_data_blocks_store?data=' + urlEncodedData;
     var xhr = new XMLHttpRequest();