diff --git a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/AbstractEpic.java b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/AbstractEpic.java
index d63d37a7..27cc2ad2 100644
--- a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/AbstractEpic.java
+++ b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/AbstractEpic.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 
 public class AbstractEpic<E extends AbstractEpic<E>> extends AbstractMinimalEpic<E> implements Serializable {
     private static final long serialVersionUID = 1L;
@@ -45,9 +46,16 @@ public String toString() {
     private References references;
     private Author author;
     private List<String> labels;
+
+    @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
     private Date startDate;
+
+    @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
     private Date dueDate;
+
+    @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
     private Date endDate;
+
     private Date createdAt;
     private Date updatedAt;
     private Date closedAt;
diff --git a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/Epic.java b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/Epic.java
index e73530d7..86556e3b 100644
--- a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/Epic.java
+++ b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/Epic.java
@@ -4,12 +4,17 @@
 
 import org.gitlab4j.models.utils.JacksonJson;
 
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
 public class Epic extends AbstractEpic<Epic> {
     private static final long serialVersionUID = 1L;
 
     private Boolean startDateIsFixed;
     private Boolean dueDateIsFixed;
+
+    @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
     private Date dueDateFromInheritedSource;
+
     private Boolean subscribed;
 
     public Boolean getStartDateIsFixed() {
diff --git a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/ImpersonationToken.java b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/ImpersonationToken.java
index 7b210b7f..b39102c3 100644
--- a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/ImpersonationToken.java
+++ b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/ImpersonationToken.java
@@ -9,6 +9,7 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 
 public class ImpersonationToken implements Serializable {
     private static final long serialVersionUID = 1L;
@@ -52,6 +53,8 @@ public String toString() {
     private Date createdAt;
     private Date lastUsedAt;
     private Boolean impersonation;
+
+    @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
     private Date expiresAt;
 
     public Boolean getActive() {
diff --git a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/ProjectAccessToken.java b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/ProjectAccessToken.java
index 44b6c93e..f2a32911 100644
--- a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/ProjectAccessToken.java
+++ b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/ProjectAccessToken.java
@@ -7,13 +7,18 @@
 import org.gitlab4j.models.Constants;
 import org.gitlab4j.models.utils.JacksonJson;
 
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
 public class ProjectAccessToken implements Serializable {
     private static final long serialVersionUID = 1L;
 
     private Long userId;
     private List<Constants.ProjectAccessTokenScope> scopes;
     private String name;
+
+    @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
     private Date expiresAt;
+
     private Long id;
     private Boolean active;
     private Date createdAt;
diff --git a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/RelatedEpic.java b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/RelatedEpic.java
index 92671519..7b584dab 100644
--- a/gitlab4j-models/src/main/java/org/gitlab4j/api/models/RelatedEpic.java
+++ b/gitlab4j-models/src/main/java/org/gitlab4j/api/models/RelatedEpic.java
@@ -4,12 +4,17 @@
 
 import org.gitlab4j.models.utils.JacksonJson;
 
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
 public class RelatedEpic extends AbstractEpic<RelatedEpic> {
     private static final long serialVersionUID = 1L;
 
     private Boolean startDateIsFixed;
     private Boolean dueDateIsFixed;
+
+    @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
     private Date dueDateFromInheritedSource;
+
     private Long relatedEpicLinkId;
     private LinkType linkType;
     private Date linkCreatedAt;
diff --git a/gitlab4j-models/src/test/resources/org/gitlab4j/models/child-epic.json b/gitlab4j-models/src/test/resources/org/gitlab4j/models/child-epic.json
index cc474e69..3354c896 100644
--- a/gitlab4j-models/src/test/resources/org/gitlab4j/models/child-epic.json
+++ b/gitlab4j-models/src/test/resources/org/gitlab4j/models/child-epic.json
@@ -22,8 +22,9 @@
     "avatar_url": "http://www.gravatar.com/avatar/a2f5c6fcef64c9c69cb8779cb292be1b?s=80&d=identicon",
     "web_url": "http://gitlab.example.com/arnita"
   },
-  "start_date": "2018-07-01T00:00:00Z",
-  "due_date": "2018-07-31T00:00:00Z",
+  "start_date": "2024-12-01",
+  "end_date": "2024-12-31",
+  "due_date": "2024-12-31",
   "created_at": "2018-07-17T13:36:22.770Z",
   "updated_at": "2018-07-18T12:22:05.239Z",
   "closed_at": "2018-08-18T12:22:05.239Z",
diff --git a/gitlab4j-models/src/test/resources/org/gitlab4j/models/epic.json b/gitlab4j-models/src/test/resources/org/gitlab4j/models/epic.json
index 7172c5bc..4c863a14 100644
--- a/gitlab4j-models/src/test/resources/org/gitlab4j/models/epic.json
+++ b/gitlab4j-models/src/test/resources/org/gitlab4j/models/epic.json
@@ -22,11 +22,11 @@
     "avatar_url": "http://www.gravatar.com/avatar/a2f5c6fcef64c9c69cb8779cb292be1b?s=80&d=identicon",
     "web_url": "http://gitlab.example.com/arnita"
   },
-  "start_date": "2018-07-01T00:00:00Z",
+  "start_date": "2018-07-01",
   "start_date_is_fixed": false,
-  "due_date": "2018-07-31T00:00:00Z",
+  "due_date": "2018-07-31",
   "due_date_is_fixed": false,
-  "due_date_from_inherited_source": "2018-07-31T00:00:00Z",
+  "due_date_from_inherited_source": "2018-07-31",
   "created_at": "2018-07-17T13:36:22.770Z",
   "updated_at": "2018-07-18T12:22:05.239Z",
   "closed_at": "2018-08-18T12:22:05.239Z",
diff --git a/gitlab4j-models/src/test/resources/org/gitlab4j/models/group-access-token.json b/gitlab4j-models/src/test/resources/org/gitlab4j/models/group-access-token.json
index d306d3eb..5af8fa97 100644
--- a/gitlab4j-models/src/test/resources/org/gitlab4j/models/group-access-token.json
+++ b/gitlab4j-models/src/test/resources/org/gitlab4j/models/group-access-token.json
@@ -11,6 +11,6 @@
     "user_id": 79,
     "last_used_at": "2023-09-28T19:26:26.675Z",
     "active": true,
-    "expires_at": "2024-06-18T00:00:00Z",
+    "expires_at": "2024-06-18",
     "access_level": 40
 }
\ No newline at end of file
diff --git a/gitlab4j-models/src/test/resources/org/gitlab4j/models/impersonation-token.json b/gitlab4j-models/src/test/resources/org/gitlab4j/models/impersonation-token.json
index a9e5a0bf..d1626baa 100644
--- a/gitlab4j-models/src/test/resources/org/gitlab4j/models/impersonation-token.json
+++ b/gitlab4j-models/src/test/resources/org/gitlab4j/models/impersonation-token.json
@@ -11,5 +11,5 @@
   "last_used_at": "2018-03-17T17:19:28.697Z",
   "id" : 3,
   "impersonation" : true,
-  "expires_at" : "2017-04-14T00:00:00Z"
+  "expires_at" : "2017-04-14"
 }
diff --git a/gitlab4j-models/src/test/resources/org/gitlab4j/models/project-access-token.json b/gitlab4j-models/src/test/resources/org/gitlab4j/models/project-access-token.json
index a2af09ab..58ebb473 100644
--- a/gitlab4j-models/src/test/resources/org/gitlab4j/models/project-access-token.json
+++ b/gitlab4j-models/src/test/resources/org/gitlab4j/models/project-access-token.json
@@ -5,7 +5,7 @@
     "read_repository"
   ],
   "name" : "Project Access Token Name",
-  "expires_at" : "2021-01-31T00:00:00Z",
+  "expires_at" : "2021-01-31",
   "id" : 10,
   "active" : true,
   "created_at" : "2021-01-20T22:11:48.151Z",
diff --git a/gitlab4j-models/src/test/resources/org/gitlab4j/models/related-epics.json b/gitlab4j-models/src/test/resources/org/gitlab4j/models/related-epics.json
index 483138a9..dc25acc4 100644
--- a/gitlab4j-models/src/test/resources/org/gitlab4j/models/related-epics.json
+++ b/gitlab4j-models/src/test/resources/org/gitlab4j/models/related-epics.json
@@ -23,11 +23,11 @@
         "avatar_url": "http://www.gravatar.com/avatar/a2f5c6fcef64c9c69cb8779cb292be1b?s=80&d=identicon",
         "web_url": "http://gitlab.example.com/arnita"
       },
-      "start_date": "2018-07-01T00:00:00Z",
+      "start_date": "2018-07-01",
       "start_date_is_fixed": false,
-      "due_date": "2018-07-31T00:00:00Z",
+      "due_date": "2018-07-31",
       "due_date_is_fixed": false,
-      "due_date_from_inherited_source": "2018-07-31T00:00:00Z",
+      "due_date_from_inherited_source": "2018-07-31",
       "created_at": "2018-07-17T13:36:22.770Z",
       "updated_at": "2018-07-18T12:22:05.239Z",
       "closed_at": "2018-08-18T12:22:05.239Z",