Although nobody's crystal ball is clear on the impact that the change in the daylight-saving time rules will have on enterprise IT systems and applications, the problems could be <A HREF="http://www.eweek.com/article2/0,1895,2098954,00.asp?kc=EWNAVEMNL022807EOAD">bigger than most people realize.</A> That's because IT shops have had less notice in dealing with the time change than they did for Y2K, and because the issue doesn't have visibility at the highest levels of an organization as it did for Y2K.