diff --git a/src/command/newsletterDatesCommand.ts b/src/command/newsletterDatesCommand.ts
index 70d789f..5b92ba6 100644
--- a/src/command/newsletterDatesCommand.ts
+++ b/src/command/newsletterDatesCommand.ts
@@ -4,7 +4,7 @@ export interface SynchronizeNewsletterDatesCommand {
 }
 
 export interface NewsletterDateCommand {
-  calendarId: number;
+  calendarId: string;
   diffTitle?: string;
   diffDescription?: string;
 }
diff --git a/src/command/newsletterDatesCommandHandler.ts b/src/command/newsletterDatesCommandHandler.ts
index f1ec22b..99ee1ad 100644
--- a/src/command/newsletterDatesCommandHandler.ts
+++ b/src/command/newsletterDatesCommandHandler.ts
@@ -17,13 +17,15 @@ export default abstract class NewsletterDatesCommandHandler {
     return await dataSource.manager
       .transaction(async (manager) => {
         let newDates = syncNewsletterDates.dates.filter(
-          (r) => !currentDates.map((np) => np.calendarId).includes(r.calendarId)
+          (r) => !currentDates.some((cd) => cd.calendarId == r.calendarId)
         );
         let removeDates = currentDates.filter(
-          (r) => !syncNewsletterDates.dates.map((np) => np.calendarId).includes(r.calendarId)
+          (r) => !syncNewsletterDates.dates.some((cd) => cd.calendarId == r.calendarId)
         );
-        let keptDates = currentDates.filter((r) =>
-          syncNewsletterDates.dates.map((np) => np.calendarId).includes(r.calendarId)
+        let keptDates = syncNewsletterDates.dates.filter(
+          (r) =>
+            currentDates.some((cd) => cd.calendarId == r.calendarId) &&
+            !removeDates.some((cd) => cd.calendarId == r.calendarId)
         );
 
         if (newDates.length != 0) {
diff --git a/src/controller/admin/newsletterController.ts b/src/controller/admin/newsletterController.ts
index 620687f..0e141f5 100644
--- a/src/controller/admin/newsletterController.ts
+++ b/src/controller/admin/newsletterController.ts
@@ -62,7 +62,7 @@ export async function getNewsletterDatesById(req: Request, res: Response): Promi
 }
 
 /**
- * @description get newsletter recipientss by id
+ * @description get newsletter recipients by id
  * @param req {Request} Express req object
  * @param res {Response} Express res object
  * @returns {Promise<*>}
@@ -70,9 +70,9 @@ export async function getNewsletterDatesById(req: Request, res: Response): Promi
 export async function getNewsletterRecipientsById(req: Request, res: Response): Promise<any> {
   let newsletterId = parseInt(req.params.newsletterId);
 
-  let recipientss = await NewsletterRecipientsService.getAll(newsletterId);
+  let recipients = await NewsletterRecipientsService.getAll(newsletterId);
 
-  res.json(NewsletterRecipientsFactory.mapToBase(recipientss));
+  res.json(NewsletterRecipientsFactory.mapToBase(recipients));
 }
 
 /**
diff --git a/src/entity/newsletterDates.ts b/src/entity/newsletterDates.ts
index 5ef80ba..aefb8ee 100644
--- a/src/entity/newsletterDates.ts
+++ b/src/entity/newsletterDates.ts
@@ -7,8 +7,8 @@ export class newsletterDates {
   @PrimaryColumn({ type: "int" })
   newsletterId: number;
 
-  @PrimaryColumn({ type: "int" })
-  calendarId: number;
+  @PrimaryColumn({ type: "varchar" })
+  calendarId: string;
 
   @Column({ type: "varchar", length: 255, nullable: true })
   diffTitle: string | null;
diff --git a/src/service/newsletterDatesService.ts b/src/service/newsletterDatesService.ts
index 5152de0..08c4b0e 100644
--- a/src/service/newsletterDatesService.ts
+++ b/src/service/newsletterDatesService.ts
@@ -13,6 +13,7 @@ export default abstract class NewsletterDatesService {
       .getRepository(newsletterDates)
       .createQueryBuilder("newsletterDates")
       .leftJoinAndSelect("newsletterDates.calendar", "calendar")
+      .leftJoinAndSelect("calendar.type", "type")
       .leftJoinAndSelect("newsletterDates.newsletter", "newsletter")
       .where("newsletterDates.newsletterId = :id", { id: newsletterId })
       .getMany()
diff --git a/src/viewmodel/admin/newsletterDates.models.ts b/src/viewmodel/admin/newsletterDates.models.ts
index a1bf0cc..074056d 100644
--- a/src/viewmodel/admin/newsletterDates.models.ts
+++ b/src/viewmodel/admin/newsletterDates.models.ts
@@ -2,7 +2,7 @@ import { CalendarViewModel } from "./calendar.models";
 
 export interface NewsletterDatesViewModel {
   newsletterId: number;
-  calendarId: number;
+  calendarId: string;
   diffTitle: string | null;
   diffDescription: string | null;
   calendar: CalendarViewModel;