"Some companies look at this as an extraordinary situation, whereas some have just incorporated it into their regular maintenance windows," he said.

One of the companies treating it as an extraordinary event is Microsoft, where administrators designated a whole weekend to roll out DST patches across the company's infrastructure, he said.

More recently, Microsoft set up a Web site for customers with information on the implications of the time change and links to product patches and other advice for consumers, as well as IT professionals.

Despite two years of lead time, however, the Daylight Savings Time issue only made it onto the radar at many enterprises in the last week or so, after the press began covering the issue more closely, said Patrick Foxhoven, CIO of CentraComm Communications, a managed security services provider in Findlay, Ohio.

"The biggest headache has just been clients contacting us who are concerned because of all the hype," he said.