# CMSDecoderCopySignerSigningTime(_:_:_:) Obtains the signing time of a CMS message, if present. ``` func CMSDecoderCopySignerSigningTime(_ cmsDecoder: CMSDecoder, _ signerIndex: Int, _ signingTime: UnsafeMutablePointer) -> OSStatus ``` ## Parameters `cmsDecoder` A CMSDecoder reference returned by the `CMSDecoderCreate` function. `signerIndex` A number indicating which signer to examine. Signer index numbers start with 0. Use the [`CMSDecoderGetNumSigners(_:_:)`](/documentation/Security/CMSDecoderGetNumSigners(_:_:)) function to determine the total number of signers for a message. `signingTime` The address of an absolute time value where the result should be stored. ## Return Value A result code. See [Security Framework Result Codes](/documentation/Security/security-framework-result-codes). Typically, this function returns [`errSecParam`](/documentation/Security/errSecParam) if the CMS message was not signed or if `signerIndex` is out of bounds. ## Discussion The timestamp is an unauthenticated time, although it is part of the signed attributes of the message. You must call [`CMSDecoderFinalizeMessage(_:)`](/documentation/Security/CMSDecoderFinalizeMessage(_:)) before you call this function. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)