If a person tests negative for hiv for the whole year that's means he or she is negative right?

Yes, if you test negative for HIV for the whole year, it means that you are negative for HIV at the time of testing. However, it is important to note that HIV can take up to three months to show up in a test after initial infection. This is known as the "window period." So, if you have engaged in behaviors that put you at risk for HIV within the past three months, you may still be infected.