如何更改apache服务器的时间，使其与计算机的时间（PHP）相匹配？

In my particular case, both the server and the client are the same computer, I'm on localhost. When i echo out the date from the date() function, it displays a totally wrong value, a 11 hours earlier time. I also tried gmdate(), but it displays the date in AM not PM. Is there any way to change the apache server time, so everytime I get it in php, it displays the same as the time on my computer? In my particular case, both the server and the