Move dynamic string to View Model

src/views/PublishView.ts

@@ -136,7 +136,7 @@ export class PublishView extends Modal implements PublishViewModelDelegate {
                     }
                 })
             )
-            .setDesc(this.viewModel.showInvalidDateMessage ? "Invalid date format" : "")
+            .setDesc(this.viewModel.invalidDateText)
     }
 
     public onClose() {

src/views/PublishViewModel.ts

@@ -132,8 +132,8 @@ export class PublishViewModel implements TagSuggestionDelegate {
         return this.isValidDate && this.isSubmitting
     }
 
-    public get showInvalidDateMessage(): boolean {
-        return !this.isValidDate
+    public get invalidDateText(): string {
+        return this.isValidDate ? "" : "Invalid date format"
     }
 
     public async publishNote() {