diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/domain/Course.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/domain/Course.java
index a391b35..95632f4 100644
--- a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/domain/Course.java
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/domain/Course.java
@@ -25,19 +25,19 @@ public class Course extends BaseEntity {
     @Column(columnDefinition = "TEXT", nullable = false)
     private String description;
 
-    @Column(nullable = false)
+    @Column
     private String duration;
 
-    @Column(nullable = false)
+    @Column
     private Integer seats;
 
-    @Column(nullable = false)
+    @Column
     private String category;
 
-    @Column(nullable = false)
+    @Column
     private String level;
 
-    @Column(nullable = false)
+    @Column
     private String instructor;
 
     private String price;
diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/domain/dto/ProfessorDto.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/domain/dto/ProfessorDto.java
index 38b4482..6f86ec0 100644
--- a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/domain/dto/ProfessorDto.java
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/domain/dto/ProfessorDto.java
@@ -6,10 +6,10 @@ import lombok.Data;
 import lombok.NoArgsConstructor;
 import net.shyshkin.study.fullstack.supportportal.backend.domain.WorkingStatus;
 import net.shyshkin.study.fullstack.supportportal.backend.domain.ProfessorCategory;
-// Add these imports at the top
 import net.shyshkin.study.fullstack.supportportal.backend.domain.dto.SkillDto;
 import net.shyshkin.study.fullstack.supportportal.backend.domain.dto.AwardDto;
 
+import com.fasterxml.jackson.annotation.JsonFormat;
 import org.springframework.web.multipart.MultipartFile;
 
 import java.time.LocalDateTime;
@@ -34,7 +34,10 @@ public class ProfessorDto {
     private String officeLocation;
     private WorkingStatus status;
     private ProfessorCategory category;
+
+    @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", timezone = "UTC")
     private LocalDateTime joinDate;
+
     private MultipartFile profileImage;
     
     // Additional fields for Next.js integration