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