2022-07-05 13:41:43 +00:00
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---
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sidebar_label: SecurityDetails.validFrom
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---
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# SecurityDetails.validFrom() method
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**Signature:**
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```typescript
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class SecurityDetails {
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validFrom(): number;
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}
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```
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**Returns:**
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number
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[Unix timestamp](https://en.wikipedia.org/wiki/Unix_time) marking the start of the certificate's validity.
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