diff --git a/src/main/java/ru/javawebinar/topjava/View.java b/src/main/java/ru/javawebinar/topjava/View.java
new file mode 100644
index 000000000..81d178333
--- /dev/null
+++ b/src/main/java/ru/javawebinar/topjava/View.java
@@ -0,0 +1,10 @@
+package ru.javawebinar.topjava;
+
+public class View {
+    public interface JsonREST {}
+    public interface JsonUI {}
+
+    // https://narmo7.wordpress.com/2014/04/26/how-to-set-up-validation-group-in-springmvc/
+    // http://forum.spring.io/forum/spring-projects/web/117289-validated-s-given-groups-should-consider-default-group-or-not
+    public interface ValidatedUI {}
+}
\ No newline at end of file
diff --git a/src/main/java/ru/javawebinar/topjava/model/Meal.java b/src/main/java/ru/javawebinar/topjava/model/Meal.java
index 0a833ecea..e6f78ddaa 100644
--- a/src/main/java/ru/javawebinar/topjava/model/Meal.java
+++ b/src/main/java/ru/javawebinar/topjava/model/Meal.java
@@ -1,16 +1,22 @@
 package ru.javawebinar.topjava.model;
 
 import com.fasterxml.jackson.annotation.JsonBackReference;
+import com.fasterxml.jackson.annotation.JsonFormat;
+import com.fasterxml.jackson.annotation.JsonGetter;
+import com.fasterxml.jackson.annotation.JsonView;
 import org.hibernate.annotations.OnDelete;
 import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.validator.constraints.Range;
 import org.springframework.format.annotation.DateTimeFormat;
+import ru.javawebinar.topjava.View;
+import ru.javawebinar.topjava.View.ValidatedUI;
 import ru.javawebinar.topjava.util.DateTimeUtil;
 
 import javax.persistence.*;
 import javax.validation.constraints.NotBlank;
 import javax.validation.constraints.NotNull;
 import javax.validation.constraints.Size;
+import javax.validation.groups.Default;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.LocalTime;
@@ -33,25 +39,25 @@ public class Meal extends AbstractBaseEntity {
     public static final String GET_BETWEEN = "Meal.getBetween";
 
     @Column(name = "date_time", nullable = false)
-    @NotNull
-    @DateTimeFormat(pattern = DateTimeUtil.DATE_TIME_PATTERN)
+    @NotNull(groups = {ValidatedUI.class, Default.class})
+    @JsonView(View.JsonREST.class)
     private LocalDateTime dateTime;
 
     @Column(name = "description", nullable = false)
-    @NotBlank
-    @Size(min = 2, max = 120)
+    @NotBlank(groups = {ValidatedUI.class, Default.class})
+    @Size(min = 2, max = 120, groups = {ValidatedUI.class, Default.class})
     private String description;
 
     @Column(name = "calories", nullable = false)
-    @NotNull
-    @Range(min = 10, max = 5000)
+    @NotNull(groups = {ValidatedUI.class, Default.class})
+    @Range(min = 10, max = 5000, groups = {ValidatedUI.class, Default.class})
     private Integer calories;
 
     @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "user_id", nullable = false)
     @OnDelete(action = OnDeleteAction.CASCADE)
     @JsonBackReference
-//    @NotNull
+    @NotNull
     private User user;
 
     public Meal() {
@@ -104,6 +110,19 @@ public void setUser(User user) {
         this.user = user;
     }
 
+
+    @JsonGetter
+    @JsonView(View.JsonUI.class)
+    @JsonFormat(pattern = DateTimeUtil.DATE_TIME_PATTERN)
+    public LocalDateTime getDateTimeUI() {
+        return dateTime;
+    }
+
+    @DateTimeFormat(pattern = DateTimeUtil.DATE_TIME_PATTERN)
+    public void setDateTimeUI(LocalDateTime dateTime) {
+        this.dateTime = dateTime;
+    }
+
     @Override
     public String toString() {
         return "Meal{" +
diff --git a/src/main/java/ru/javawebinar/topjava/repository/jdbc/JdbcMealRepository.java b/src/main/java/ru/javawebinar/topjava/repository/jdbc/JdbcMealRepository.java
index 775d314ed..9ff92e631 100644
--- a/src/main/java/ru/javawebinar/topjava/repository/jdbc/JdbcMealRepository.java
+++ b/src/main/java/ru/javawebinar/topjava/repository/jdbc/JdbcMealRepository.java
@@ -9,6 +9,7 @@
 import org.springframework.jdbc.core.simple.SimpleJdbcInsert;
 import org.springframework.stereotype.Repository;
 import org.springframework.transaction.annotation.Transactional;
+import ru.javawebinar.topjava.View;
 import ru.javawebinar.topjava.model.Meal;
 import ru.javawebinar.topjava.repository.MealRepository;
 import ru.javawebinar.topjava.util.ValidationUtil;
@@ -40,7 +41,7 @@ public JdbcMealRepository(JdbcTemplate jdbcTemplate, NamedParameterJdbcTemplate
     @Override
     @Transactional
     public Meal save(Meal meal, int userId) {
-        ValidationUtil.validate(meal);
+        ValidationUtil.validate(meal, View.ValidatedUI.class);
 
         MapSqlParameterSource map = new MapSqlParameterSource()
                 .addValue("id", meal.getId())
diff --git a/src/main/java/ru/javawebinar/topjava/to/MealTo.java b/src/main/java/ru/javawebinar/topjava/to/MealTo.java
index 059f14a44..526f26e40 100644
--- a/src/main/java/ru/javawebinar/topjava/to/MealTo.java
+++ b/src/main/java/ru/javawebinar/topjava/to/MealTo.java
@@ -1,11 +1,18 @@
 package ru.javawebinar.topjava.to;
 
+import com.fasterxml.jackson.annotation.JsonFormat;
+import com.fasterxml.jackson.annotation.JsonGetter;
+import com.fasterxml.jackson.annotation.JsonView;
+import ru.javawebinar.topjava.View;
+import ru.javawebinar.topjava.util.DateTimeUtil;
+
 import java.beans.ConstructorProperties;
 import java.time.LocalDateTime;
 import java.util.Objects;
 
 public class MealTo extends BaseTo {
 
+    @JsonView(View.JsonREST.class)
     private final LocalDateTime dateTime;
 
     private final String description;
@@ -56,6 +63,13 @@ public int hashCode() {
         return Objects.hash(id, dateTime, description, calories, excess);
     }
 
+    @JsonGetter
+    @JsonView(View.JsonUI.class)
+    @JsonFormat(pattern = DateTimeUtil.DATE_TIME_PATTERN)
+    public LocalDateTime getDateTimeUI() {
+        return dateTime;
+    }
+
     @Override
     public String toString() {
         return "MealTo{" +
diff --git a/src/main/java/ru/javawebinar/topjava/util/ValidationUtil.java b/src/main/java/ru/javawebinar/topjava/util/ValidationUtil.java
index 93e5a4b93..e3ddddcfe 100644
--- a/src/main/java/ru/javawebinar/topjava/util/ValidationUtil.java
+++ b/src/main/java/ru/javawebinar/topjava/util/ValidationUtil.java
@@ -23,9 +23,9 @@ public class ValidationUtil {
     private ValidationUtil() {
     }
 
-    public static <T> void validate(T bean) {
+    public static <T> void validate(T bean, Class<?>... groups) {
         // https://alexkosarev.name/2018/07/30/bean-validation-api/
-        Set<ConstraintViolation<T>> violations = validator.validate(bean);
+        Set<ConstraintViolation<T>> violations = validator.validate(bean, groups);
         if (!violations.isEmpty()) {
             throw new ConstraintViolationException(violations);
         }
diff --git a/src/main/java/ru/javawebinar/topjava/web/json/JacksonObjectMapper.java b/src/main/java/ru/javawebinar/topjava/web/json/JacksonObjectMapper.java
index 8237df93b..58704d86d 100644
--- a/src/main/java/ru/javawebinar/topjava/web/json/JacksonObjectMapper.java
+++ b/src/main/java/ru/javawebinar/topjava/web/json/JacksonObjectMapper.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.datatype.hibernate5.Hibernate5Module;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import ru.javawebinar.topjava.View;
 
 /**
  * <p>
@@ -29,6 +30,9 @@ private JacksonObjectMapper() {
         setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE);
         setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
         setSerializationInclusion(JsonInclude.Include.NON_NULL);
+
+//      https://stackoverflow.com/questions/22875642/jackson-set-default-view
+        setConfig(getSerializationConfig().withView(View.JsonREST.class));
     }
 
     public static ObjectMapper getMapper() {
diff --git a/src/main/java/ru/javawebinar/topjava/web/json/JsonUtil.java b/src/main/java/ru/javawebinar/topjava/web/json/JsonUtil.java
index fda04590d..99618d333 100644
--- a/src/main/java/ru/javawebinar/topjava/web/json/JsonUtil.java
+++ b/src/main/java/ru/javawebinar/topjava/web/json/JsonUtil.java
@@ -2,6 +2,7 @@
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectReader;
+import com.fasterxml.jackson.databind.ObjectWriter;
 
 import java.io.IOException;
 import java.util.List;
@@ -34,4 +35,12 @@ public static <T> String writeValue(T obj) {
             throw new IllegalStateException("Invalid write to JSON:\n'" + obj + "'", e);
         }
     }
+
+    public static <T> String writeValue(T obj, ObjectWriter ow) {
+        try {
+            return ow.writeValueAsString(obj);
+        } catch (JsonProcessingException e) {
+            throw new IllegalStateException("Invalid write to JSON:\n'" + obj + "'", e);
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/main/java/ru/javawebinar/topjava/web/meal/MealUIController.java b/src/main/java/ru/javawebinar/topjava/web/meal/MealUIController.java
index 2b4f2bdcd..19363b882 100644
--- a/src/main/java/ru/javawebinar/topjava/web/meal/MealUIController.java
+++ b/src/main/java/ru/javawebinar/topjava/web/meal/MealUIController.java
@@ -1,16 +1,19 @@
 package ru.javawebinar.topjava.web.meal;
 
+import com.fasterxml.jackson.annotation.JsonView;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.lang.Nullable;
 import org.springframework.validation.BindingResult;
+import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
+import ru.javawebinar.topjava.View;
+import ru.javawebinar.topjava.View.ValidatedUI;
 import ru.javawebinar.topjava.model.Meal;
 import ru.javawebinar.topjava.to.MealTo;
 import ru.javawebinar.topjava.util.ValidationUtil;
 
-import javax.validation.Valid;
 import java.time.LocalDate;
 import java.time.LocalTime;
 import java.util.List;
@@ -21,12 +24,14 @@ public class MealUIController extends AbstractMealController {
 
     @Override
     @GetMapping
+    @JsonView(View.JsonUI.class)
     public List<MealTo> getAll() {
         return super.getAll();
     }
 
     @Override
     @GetMapping( "/{id}")
+    @JsonView(View.JsonUI.class)
     public Meal get(@PathVariable int id) {
         return super.get(id);
     }
@@ -40,7 +45,7 @@ public void delete(@PathVariable int id) {
 
     @PostMapping
     @ResponseStatus(HttpStatus.NO_CONTENT)
-    public ResponseEntity<String> createOrUpdate(@Valid Meal meal, BindingResult result) {
+    public ResponseEntity<String> createOrUpdate(@Validated(ValidatedUI.class) Meal meal, BindingResult result) {
         if (result.hasErrors()) {
             return ValidationUtil.getErrorResponse(result);
         }
@@ -54,6 +59,7 @@ public ResponseEntity<String> createOrUpdate(@Valid Meal meal, BindingResult res
 
     @Override
     @GetMapping("/filter")
+    @JsonView(View.JsonUI.class)
     public List<MealTo> getBetween(
             @RequestParam @Nullable LocalDate startDate,
             @RequestParam @Nullable LocalTime startTime,
diff --git a/src/main/webapp/WEB-INF/jsp/meals.jsp b/src/main/webapp/WEB-INF/jsp/meals.jsp
index f66313bb3..783b3b2cc 100644
--- a/src/main/webapp/WEB-INF/jsp/meals.jsp
+++ b/src/main/webapp/WEB-INF/jsp/meals.jsp
@@ -79,7 +79,7 @@
 
                     <div class="form-group">
                         <label for="dateTime" class="col-form-label"><spring:message code="meal.dateTime"/></label>
-                        <input class="form-control" id="dateTime" name="dateTime" autocomplete="off"
+                        <input class="form-control" id="dateTime" name="dateTimeUI" autocomplete="off"
                                placeholder="<spring:message code="meal.dateTime"/>">
                     </div>
 
diff --git a/src/main/webapp/resources/js/topjava.common.js b/src/main/webapp/resources/js/topjava.common.js
index 3df7f5c58..972154a44 100644
--- a/src/main/webapp/resources/js/topjava.common.js
+++ b/src/main/webapp/resources/js/topjava.common.js
@@ -33,18 +33,12 @@ function updateRow(id) {
     $("#modalTitle").html(i18n["editTitle"]);
     $.get(ctx.ajaxUrl + id, function (data) {
         $.each(data, function (key, value) {
-            form.find("input[name='" + key + "']").val(
-                key === "dateTime" ? formatDate(value) : value
-            );
+            form.find("input[name='" + key + "']").val(value);
         });
         $('#editRow').modal();
     });
 }
 
-function formatDate(date) {
-    return date.replace('T', ' ').substr(0, 16);
-}
-
 function deleteRow(id) {
     if (confirm(i18n['common.confirm'])) {
         $.ajax({
diff --git a/src/main/webapp/resources/js/topjava.meals.js b/src/main/webapp/resources/js/topjava.meals.js
index 5036a03c9..bd2d70f1d 100644
--- a/src/main/webapp/resources/js/topjava.meals.js
+++ b/src/main/webapp/resources/js/topjava.meals.js
@@ -21,13 +21,7 @@ $(function () {
     makeEditable({
         "columns": [
             {
-                "data": "dateTime",
-                "render": function (date, type, row) {
-                    if (type === 'display') {
-                        return formatDate(date);
-                    }
-                    return date;
-                }
+                "data": "dateTimeUI"
             },
             {
                 "data": "description"
diff --git a/src/test/java/ru/javawebinar/topjava/web/json/JsonUtilTest.java b/src/test/java/ru/javawebinar/topjava/web/json/JsonUtilTest.java
index 540586d11..67d68472e 100644
--- a/src/test/java/ru/javawebinar/topjava/web/json/JsonUtilTest.java
+++ b/src/test/java/ru/javawebinar/topjava/web/json/JsonUtilTest.java
@@ -1,12 +1,16 @@
 package ru.javawebinar.topjava.web.json;
 
+import com.fasterxml.jackson.databind.ObjectWriter;
 import org.junit.jupiter.api.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import ru.javawebinar.topjava.View;
 import ru.javawebinar.topjava.model.Meal;
 
 import java.util.List;
 
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.MatcherAssert.assertThat;
 import static ru.javawebinar.topjava.MealTestData.*;
 
 class JsonUtilTest {
@@ -27,4 +31,12 @@ void readWriteValues() {
         List<Meal> actual = JsonUtil.readValues(json, Meal.class);
         MEAL_MATCHER.assertMatch(actual, meals);
     }
+
+    @Test
+    public void writeWithView() {
+        ObjectWriter uiWriter = JacksonObjectMapper.getMapper().writerWithView(View.JsonUI.class);
+        String json = JsonUtil.writeValue(adminMeal1, uiWriter);
+        System.out.println(json);
+        assertThat(json, containsString("dateTimeUI"));
+    }
 }
\ No newline at end of file