puppeteer/website/versioned_docs/version-16.1.0/api/puppeteer.securitydetails.validfrom.md
release-please[bot] 2d5f216621
chore(main): release 16.1.0 (#8743)
* chore(main): release 16.1.0

* chore: generate versioned docs

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
2022-08-06 16:49:20 +02:00

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---
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.