' is set in the 2150s, and ties into the Cochrane backstory. The show uses the Gregorian calendar instead of Stardates, making tracking the dating easier. Its pilot, "", depicts first contact with the Klingons occurring much earlier than the Okuda chronology anticipated (it suggested a date of 2218, based on a line in "Day of the Dove", noting that dialog in makes this problematic – though the actual line in the episode referred to "hostilities" between the two, and in ' Human-Klingon relations, while by no means friendly, clearly do not rise to the de facto state of war shown in "TOS"). It shows the opening of the Romulan war and the start of a coalition between Earth, Vulcan, Andor, and Tellar in the 2150s. The date of the founding year of the Federation, 2161, was revealed in the fifth-season "TNG" episode "The Outcast," based on an early draft of the Okuda timeline. The final episode of "", "These Are the Voyages...", is consistent with the establishment of 2161 as the founding year for the Federation.