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This article provides an unofficial timeline of recorded important events in the Warcraft universe compiled from official timelines and all sources published by Blizzard . Blizzard has used two standards when establishing dates in various official timelines, both based on the opening of the Dark Portal . Numbering is based on the opening of the Dark Portal, as this is the method used by the latest sources. Some sources have the opening of the Dark Portal as about 25 years before the start of World of Warcraft , and other dates state that it was about 30 years before the start of World of Warcraft .