Time zones, Daylight Saving Time, and e-mail

Published: September 7, 2006

Time zones and Daylight Saving Time (DST) are sometimes confusing. If you travel between time zones, do you set your clock forward or back? If a friend sends you an e-mail at noon, whose time zone is reflected in Microsoft Outlook—yours or your friend’s? What day should you change your clock for daylight-saving time, and do you move forward or back an hour?

Fortunately, Microsoft Windows XP helps you answer these questions by automatically translating times from other computers into your local time zone. Windows XP can also automatically adjust your clock for DST. Traveling between time zones is easy because you can select the new time zone, and Windows XP sets your clock correctly.

Your computer keeps track of time using Greenwich Mean Time (GMT). Your computer automatically adjusts the time on your system clock, in incoming e-mail messages, in the Event Viewer administrative tool, and elsewhere to the correct time zone. It is important for you to set your time zone correctly and to update it when you travel. If your time zone isn't kept up to date—even if your clock is set correctly on your computer—the time stamps on e-mail messages you send will be wrong.

For example, if you are in the Eastern United States time zone (GMT-5), and a friend in the Pacific United States time zone (GMT-8) sends you an e-mail at 8:00 A.M. (your friend’s time), Outlook converts the time to 11:00 A.M. to reflect your local time zone. Similarly, if you monitor events on remote computers in other time zones, Event Viewer always displays those event dates and times in your local time zone.

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