diff --git a/packages/daf-core/src/entities/credential.ts b/packages/daf-core/src/entities/credential.ts
index 6def46937..b3287d8d7 100644
--- a/packages/daf-core/src/entities/credential.ts
+++ b/packages/daf-core/src/entities/credential.ts
@@ -76,8 +76,8 @@ export class Credential extends BaseEntity {
   )
   subject: Identity
 
-  @Column({ nullable: true })
-  issuanceDate?: Date
+  @Column()
+  issuanceDate: Date
 
   @Column({ nullable: true })
   expirationDate?: Date
diff --git a/packages/daf-core/src/entities/presentation.ts b/packages/daf-core/src/entities/presentation.ts
index e57628a6c..70a294356 100644
--- a/packages/daf-core/src/entities/presentation.ts
+++ b/packages/daf-core/src/entities/presentation.ts
@@ -48,8 +48,8 @@ export class Presentation extends BaseEntity {
   )
   audience: Identity
 
-  @Column({ nullable: true })
-  issuanceDate?: Date
+  @Column()
+  issuanceDate: Date
 
   @Column({ nullable: true })
   expirationDate?: Date