Fix editing publication

src/app/models/publication.ts

@@ -1,12 +1,12 @@
 /* import { Image } from './image'; */
 
 export class Publication{
-    DateIndex: Date;
+    DateIndex: Date | string;
     DocumentId:string;
     ProcessId:string;
     Title: string;
     Message: string;
-    DatePublication: Date;
+    DatePublication:  Date | string;
     OriginalFileName?: string;
     FileBase64?:string;
     FileExtension?: string;