Adding date validations when updating device enrollment

components/mobile-plugins/android-plugin/org.wso2.carbon.device.mgt.mobile.android.api/src/main/java/org/wso2/carbon/mdm/services/android/services/impl/DeviceManagementServiceImpl.java

@@ -260,7 +260,16 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
     @Override
     public Response modifyEnrollment(@PathParam("id") String id, @Valid AndroidDevice androidDevice) {
         Device device = new Device();
+        String msg = "";
         device.setType(DeviceManagementConstants.MobileDeviceTypes.MOBILE_DEVICE_TYPE_ANDROID);
+        if(androidDevice.getEnrolmentInfo().getDateOfEnrolment() <= 0){
+            msg = "Invalid Enrollment date.";
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
+        }
+        if(androidDevice.getEnrolmentInfo().getDateOfLastUpdate() <= 0){
+            msg = "Invalid Last Updated date.";
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
+        }
         device.setEnrolmentInfo(androidDevice.getEnrolmentInfo());
         device.getEnrolmentInfo().setOwner(AndroidAPIUtils.getAuthenticatedUser());
         device.setDeviceInfo(androidDevice.getDeviceInfo());
@@ -281,7 +290,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                         "carries the id '" + id + "' has not been updated").build();
             }
         } catch (DeviceManagementException e) {
-            String msg = "Error occurred while modifying enrollment of the Android device that carries the id '" +
+            msg = "Error occurred while modifying enrollment of the Android device that carries the id '" +
                     id + "'";
             log.error(msg, e);
             throw new UnexpectedServerErrorException(