I started receiving this error on my search results pages when I was attempting to make some changes and tweaks. I mentioned it to Shane and he had said he ran into the same issue a week or so ago and posted about it. The issue relates to the Timezone not being set for the web application we were using on our virtual machine. To fix, log into Central Admin and change the timezone within the General Settings section of your web application settings. You will want to do an IISReset and then all should be good.