puppeteer/website/versioned_docs/version-21.3.8/api/puppeteer.securitydetails.validfrom.md
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---
sidebar_label: SecurityDetails.validFrom
---
# SecurityDetails.validFrom() method
[Unix timestamp](https://en.wikipedia.org/wiki/Unix_time) marking the start of the certificate's validity.
#### Signature:
```typescript
class SecurityDetails {
validFrom(): number;
}
```
**Returns:**
number