Gem Nation -- Glossary of Diamond, Jewelry and Watch Terminology 
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  UTC: Universal Time Co-ordinated
Universal time based on Greenwich Meridian used by the military and in aviation. Greenwich Mean Time (GMT) is approximately equivalent to Universal Time Co-ordinated (UTC). UTC has rendered GMT largely obsolete. Using this timezone/standard avoids errors and problems associated with timezone differences and daylight savings times that are operational in various countries.
   
 

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