Why can't I change the date and time on my Chromebook?

I'm trying to set up my Acer Chromebook and connected to my school's Wi-Fi. However, to sign into the network, I need to change the date and time, which doesn't match the current time zone. When I try to update the date and time, nothing happens—even though my mouse is working fine. I'm not sure if it's an issue with the Wi-Fi or my school specifically, but I really want to get this computer set up. Any advice would be really appreciated!