If you dodge every virus date, you'd be forever tweaking the system date....
Eek! - it's April the 26th - BOOM!
http://www.symantec.com/avcenter/venc/data/cih.html Good Info, and though it's too late for anyone who encountered the payload today, also a free removal tool.
It's actually refreshing to see a mention of an old-style "file infection" virus, when 99% of current threats are worms, rather than viruses - maybe I'm making the wrong distinction, but if it makes an incursion into one of the vastly excessive number of hiding places in Windows, I thought that made it a worm, not a virus.