Incorrect time stamps on websites when using my Manjaro laptop.

I've checked the system time in the BIOS and the OS time in Manjaro--both are correct (that is, both correctly set to my time zone: PDT). But whenever I go to a website that displays the time (Google Voice, Cronometer.com) I get a time stamp that seems to be UTC +7 hours from my PDT location.

I don't know what else to check or change.