How to find out the system time when a message is received from a socket?

Hi, I am trying to conduct an experiment that determines message-propagation delays, processor speed differences, and clock synchronization errors between 2 computers. I am running the experiment using both TCP/IP and UDP connections. I just wondered, if I could get the system time when a message is received,  I could possibly calculate the message progapation delay. However, I am not clear how to get the time stamp whenever a message is received. Could someone help me with this?
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Well when you detect the message by listening to the socket just get the system time if a message is recieved. I'm assuming here that you are detecting when a message is recieved. I believe that to get the system time it's something like

DateTime CurrTime = DateTime.Now;

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