Creation of appointment implemented

src/main/java/de/etecture/ga/model/Appointment.java

@@ -1,6 +1,9 @@
 package de.etecture.ga.model;
 
 import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
 import java.util.Date;
 
 import org.springframework.data.annotation.Id;
@@ -32,4 +35,14 @@ public class Appointment {
 	private Integer slot = 1;
 	
 	private Duration duration = Duration.ZERO;
+	
+	
+	public LocalDateTime appointmentStart() {
+		return Instant.ofEpochMilli(this.appointmentTime().getTime())
+				.atZone(ZoneId.systemDefault()).toLocalDateTime();
+	}
+	
+	public LocalDateTime appointmentEnd() {
+		return this.appointmentStart().plus(this.duration());
+	}
 }