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Understanding Time Zones

The Oracle9i database introduced the ability to use different time zones. A time zone is an offset from the time in Greenwich, England. The time in Greenwich was once known as Greenwich Mean Time (GMT), but is now known as Coordinated Universal Time (UTC, which comes from the French initials for the words). You specify a time zone using either an offset from UTC or the name of the region. When you specify an offset, you use HH:MI prefixed with a plus or minus sign:

+|-HH:MI


  

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