Anti-Virus Software Doesn't Recognize Daylight Saving Time

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When you change to or from daylight saving time, time stamps of your files change by one hour to account for those that don't use daylight saving time. An anti-virus program that does not keep track of daylight saving time does not adjustment its time table.

To explain why Windows NT does this, here's a quick example. Say you were comparing the time of two files, X and Y. You want to make sure that file Y is always up-to-date, and Y depends on X. So you update the information in Y when X has changed. (NOTE: This is often used in programming project management to make sure that your executable is up-to-date by comparing it to its source.) If X and Y existed in two different locations, one that observes daylight saving time and another that does not, you might run into a problem comparing the time values. If the time doesn't change, then the information in Y could be updated prematurely.

If you want to change the clock manually:

1. In the Control Panel window, choose the Date/Time icon.
2. In the Date/Time dialog box, clear the Automatically Adjust for Daylight Saving Time check box.

The time stamps of files aren't affected when you manually change the clock.