started converting the x-axis to hours

src/main/java/com/application/GUI/LineChartFunctionality.java

 package com.application.GUI;
 
-import com.application.DB.DB;
 import javafx.scene.chart.CategoryAxis;
 import javafx.scene.chart.LineChart;
 import javafx.scene.chart.NumberAxis;
 import javafx.scene.chart.XYChart;
+import javafx.scene.shape.Line;
 
+import java.text.SimpleDateFormat;
+import java.util.Date;
 import java.util.Map;
 
 public class LineChartFunctionality {
@@ -42,6 +44,27 @@ public class LineChartFunctionality {
         lineChart.getData().clear();
     }
 
+    private static long findDifference(String start_date, String end_date) {
+        // Defining a simple date format
+        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+
+        try{
+            // try to convert the string to Date datatype
+            Date dateStart = dateFormat.parse(start_date);
+            Date dateEnd = dateFormat.parse(end_date);
+
+            // Finds the difference in millis
+            long differenceMillis = dateEnd.getTime() - dateStart.getTime();
+
+           // Finds the difference in minutes
+            return (differenceMillis / (1000 * 60 )) % 60;
+
+        } catch (Exception e) {
+            System.out.println(e.getMessage());
+        }
+        return 0;
+    }
+
 
     public static LineChart<String, Number> loadSingleSeries(Map<Integer, Map<String, Number>> userInput) throws Exception {
         clearLineChart();
@@ -54,20 +77,34 @@ public class LineChartFunctionality {
             Map data = entryKwh.getValue();
             //System.out.println(data.size());
             XYChart.Series<String, Number> newSeries = new XYChart.Series<String, Number>();
-            int index = 0;
+            long minutes = 0;
+            long hours;
+            String previouseDate = "";
             for (Object entryData : data.entrySet()) {
                 //System.out.println("data: \t"+entryData);
                 String entryString = entryData.toString();
                 String[] arr = entryString.split("=");
-                String date = arr[0];
+                String currentDate = arr[0];
                 int kwhValue = Integer.parseInt(arr[1]);
 
+
+                //System.out.printf("previouse date: \t%s\n",previouseDate);
+                //System.out.printf("Current date: \t\t%s\n",currentDate);
+                //System.out.printf("is prev empty?: \t%s\n",previouseDate.isEmpty());
+
+
+                minutes += findDifference(previouseDate, currentDate);
+
+                hours = (minutes/60);
+                System.out.println(hours);
+                previouseDate = currentDate;
+
                 //System.out.printf("Date: \t%s\t\t\tkWh: \t%s\n",date,kwhValue);
+                //System.out.printf("Hours: \t\t%s\n",hours);
 
 
                 // Connect the data to a series
-                newSeries.getData().add(new XYChart.Data<String, Number>(String.valueOf(index), kwhValue));
-                index += 1;
+                newSeries.getData().add(new XYChart.Data<String, Number>(String.valueOf(hours), kwhValue));
             }
             updateLineChart(newSeries);
         }

src/main/java/com/application/Main.java

@@ -85,7 +85,7 @@ public class Main extends Application {
         this.sideBar = createSideBar();
         this.logoBar = createLogoBar();
 
-        LineChart<String, Number> lineChart = this.lineChartFunctionality.getLineChart();
+        LineChart<String, Number> lineChart = LineChartFunctionality.getLineChart();
 
         //Set id's to connect to css stylesheet
         root.setId("root");