add DatePipe to providers in routing module (#1570)

src/app/oss-routing.module.ts

@@ -1,3 +1,4 @@
+import { DatePipe } from "@angular/common";
 import { NgModule } from "@angular/core";
 import { RouterModule, Routes } from "@angular/router";
 
@@ -473,5 +474,6 @@ const routes: Routes = [
     }),
   ],
   exports: [RouterModule],
+  providers: [DatePipe],
 })
 export class OssRoutingModule {}