10,000 Days sold 564,000 copies in Japan.
In specific applications, the definition of a day is slightly modified, such as in the ISQ day (exactly 86,400 seconds) used for computers and standards keeping, local mean time accounting of the Earth's natural fluctuation of a solar day, and stellar day and sidereal day (using the celestial sphere) used for astronomy
 As of 2015, throughout the world, 40 such zones are now in use: the central zone, from which all others are defined as offsets, is known as UTC00, which uses Coordinated Universal Time (UTC)

