firebase.firestore.FieldValue.serverTimestamp() doesn't support Timestamp data type

async createUser(uid: string, email: string) {
await this.afs.doc<UserProfileModel>(FirestoreDbConstant.USER_PROFILES + `/${uid}`).set({
email,
createdDate: firebase.firestore.FieldValue.serverTimestamp(),
});
}


This model works

export interface UserProfileModel {
email: string;
createdDate?: firebase.firestore.FieldValue;
}


But Why I cannot use Timestamp here like so?

import { Timestamp } from '@firebase/firestore-types';

export interface UserProfileModel {
email: string;
createdDate?: Timestamp;
}


Then it gives this error:

(property) UserProfileModel.createdDate?: Timestamp Type 'FieldValue' is missing the following properties from type 'Timestamp': seconds, nanoseconds, toDate, toMillists(2739) user-profile.model.ts(11, 5): The expected type comes from property 'createdDate' which is declared here on type 'UserProfileModel'
​

The problem here is I need to use toDate() on the template. But it doesn't work with the createdDate?: firebase.firestore.FieldValue;

<p>{{invitedEvent.startDatetime.toDate() | amDateFormat: 'MMM DD'}}</p>

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