[Home](./index.md) > [@firebase/firestore](./firestore.md) > [/](./firestore_.md) > [Timestamp](./firestore_.timestamp.md) > [valueOf](./firestore_.timestamp.valueof.md) ## Timestamp.valueOf() method Converts this object to a primitive string, which allows Timestamp objects to be compared using the `>`, `<=`, `>=` and `>` operators. Signature: ```typescript valueOf(): string; ``` Returns: string