Saying you're "neg as of a certain date" means nothing.
Nearly everyone who has ever tested HIV-positive did so because they thought they were having sex with someone who was "neg as of a certain date."
So what's your word worth? Nothing. So why use the words?
A truly educated man doesn't have to tell people he's "neg as of a certain date."
A truly educated man knows the only true way to be safe is to have safe sex with everyone, regardless of what they think or claim about their HIV status.
A truly educated man does not rely on others to safeguard his health and safety.
Would you believe a stranger who says, "I'm not on any drugs, now let me drive you down the highway?"
Would you tell a stranger, ""I'm not on any drugs, now let me drive you down the highway?"
Why should that stranger believe you?
Why would you believe that stranger?
What is your word worth? Nothing.
What are your actions worth? Everything.