diff --git a/main.go b/main.go
index 5df7e0b..61530d5 100644
--- a/main.go
+++ b/main.go
@@ -25,28 +25,79 @@ import (
 	"fmt"
 	"os"
 	"time"
+	"encoding/json"
+	"io/ioutil"
 )
 
-func start() {
-	fmt.Print(time.Now().Format("2 Jan 2006 15:04:05"))
-        fmt.Println(" Start record")
+type Record struct {
+	Start time.Time
+	End time.Time
 }
 
-func stop() {
+type Records struct {
+	Entries []Record
+}
+
+func start() Record {
+	fmt.Print(time.Now().Format("2 Jan 2006 15:04:05"))
+        fmt.Println(" Start record")
+	return Record{Start: time.Now()}
+}
+
+func stop(entry *Record) {
 	fmt.Print(time.Now().Format("2 Jan 2006 15:04:05"))
         fmt.Println(" Stop record")
+	entry.End = time.Now()
 }
 
 
 func main() {
 	args := os.Args[1:]
 
-	switch args[0] {
-	case "start":
-		start()
-	case "stop":
-		stop()
-	default:
-		fmt.Println("Missing argument")
+	// representation of the data
+	data := Records {
+		Entries: []Record {},
 	}
+
+
+	jsonFile, err := os.Open("test.json")
+
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	byteValue, _ := ioutil.ReadAll(jsonFile)
+
+//	var records Records
+	var current *Record
+	json.Unmarshal(byteValue, &data)
+
+	for i := 0; i < len(data.Entries); i++ {
+		if data.Entries[i].End.IsZero() {
+			fmt.Println("Running Task: ")
+			fmt.Println(data.Entries[i].Start)
+			current = &data.Entries[i]
+		}
+	}
+
+	if len(args) > 0 {
+		switch args[0] {
+		case "start":
+			if current == nil {
+				data.Entries = append(data.Entries, start())
+			} else {
+				fmt.Println("There is already a time tracking running")
+			}
+		case "stop":
+			fmt.Println(current)
+			stop(current)
+			fmt.Println(current)
+		default:
+			fmt.Println("Unknown argument")
+		}
+
+	}
+	file, _ := json.MarshalIndent(data, "", " ")
+	_ = ioutil.WriteFile("test.json", file, 0644)
+
 }