According to the “Star Trek” writer’s guide, the Starfleet calendar system was invented to deemphasize the in-universe date. As the guide puts it, “We invented ‘Stardate’ to avoid continually mentioning Star Trek’s century (actually, about two hundred years from now), and getting into arguments about whether this or that would have developed by then.”
Speaking on the 1988 documentary “Inside Star Trek: The Real Story,” de Forest emphasized that this almost wasn’t the case since the original script contained dates from the Gregorian calendar. Upon reviewing the script, de Forest felt this didn’t feel right for the future spacefaring society. As a solution, he pitched the Julian-inspired concept, which the tech advisor felt had a futuristic vibe thanks to its use of decimals.
While “Star Trek” creator Gene Roddenberry liked the concept as a jumping-off point, his version was always meant to be a little esoteric, as Samuel A. Peeples, who wrote the second pilot for “Star Trek: The Original Series,” recounted in “Gene Roddenberry: The Myth and Man Behind Star Trek.” According to Peeples, “We tried to set up a system that would be unidentifiable unless you knew how we did it.” Conceptualizing the revised stardate system over drinks, Roddenberry and Peeples took into account the weirdness of space and relative time, ultimately concluding that any date-related continuity errors in “Star Trek” could be chalked up to these issues. Or as the “Star Trek” writer’s guide put it, “Stardates are a mathematical formula which varies depending on location in the galaxy, velocity of travel, and other factors, can vary widely from episode to episode.” In other words, don’t think too hard about it.