website show only contents according web server dates

i have a question want to ask":

if my website has 5 tabs, each tab equals everyday's menu, i would like to do the things like when the user open my website, the browser will automatically change to today's menu according to web server's time?

So how do i do this? Any keywords i can find?

my website url is http://www.oyzgroup.com

in the menu "lunch buffet" i want the user see todays menu tab

Thanks everyone!