 Possibly because of this, the Federation had changed the Earth's Gregorian calendar (the so-called "Old Calendar") to the "New Calendar" for date keeping.In the first episode "The Way Back" a date was given as "52.6.8" suggesting by the New Calendar the year was either 152 or 252.It is uncertain when the "New Calendar" was set in place, but it was possibly established at the founding of the Federation.