puppeteer/website/versioned_docs/version-19.7.3/api/puppeteer.securitydetails.validfrom.md

---
sidebar_label: SecurityDetails.validFrom
---

# SecurityDetails.validFrom() method

#### Signature:

```typescript
class SecurityDetails {
  validFrom(): number;
}
```

**Returns:**

number

[Unix timestamp](https://en.wikipedia.org/wiki/Unix_time) marking the start of the certificate's validity.