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During the handshake, the client and server send each other "random values", which are sequences of 32 random bytes. The "client random" is part of the ClientHello message, while the "server random" is part of the ServerHello message. In both cases, the first four bytes of the random value encode the current date and time (number of seconds since January ...


TLS as a protocol does not depend on a the system time. The only point where the system time is used is in the Random field of the Client Hello and Server Hello handshake messages. From RFC 5246 (TLS 1.2): Clocks are not required to be set correctly by the basic TLS protocol; higher-level or application protocols may define additional requirements ...

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