[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Security](./puppeteer.protocol.security.md) > [CertificateSecurityState](./puppeteer.protocol.security.certificatesecuritystate.md) > [validFrom](./puppeteer.protocol.security.certificatesecuritystate.validfrom.md) ## Protocol.Security.CertificateSecurityState.validFrom property Certificate valid from date. Signature: ```typescript validFrom: Network.TimeSinceEpoch; ```