so i searched some (on google itself, of course) and found that one of the reference times is your computer's. so this basically indicates that my comp's clock is out of sync with the real world. now why would gmail do that? rahul said that they are using javascript to refresh that thing so that they won't have to reload a page every time. but then the script could have noted the comp time when it first loaded, and taken this into account when calculating future times [ would have worked fine unless you changed your comp time while reading a mail]. this page provides an alternate explanation.anyways, i now have an alternate way of knowing when my comp's clock is running behind.[:P]