Mine Years is the current time of the planet Minearth. It is parallel to the real-life planet Earth, albeit 57 years ahead in time (eg the year 1987 on Earth is the year 2044 on Minearth). The current year in Mine Years is 2071. Previously, Mine Years was 55 years ahead instead of 57, but in 2068 it was discovered that Mine Years was slow in time and had to be pushed 2 years forward. Thus, December 31, 2068 went straight to January 1, 2071, skipping years 2069 and 2070.