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(Optional) The time of signing. Depending on the signature handler, this may be a normal unverified computer time or a time generated in a verifiable way from a secure time server.
This value should be used only when the time of signing is not available in the signature.
Example: A time stamp can be embedded in a PKCS#7 binary data object (see 12.8.3.3, "PKCS#7 Signatures as used in ISO 32000").