365-day calendar 365-day calendar A 365-day calendar consists of exactly 365 days per year (no leap days), and is primarily used in computer models and as an assumption in every-day calculations. For example, a calculation of a daily rate may use an annual total divided by exactly 365. Interest rates in some banks are calculated using a 365-day calendar. Some Mesoamerican calendars used a 365-day year with no leap year, resulting in a gradual shift of the seasons relative to the calendar. This includes the Maya Haab' and the Aztec Xiuhpohualli calendars. Some versions of the Zoroastrian calendar also use a fixed
Adoption of the Gregorian calendar when a 13th Julian leap day was skipped in 1900, so the tax year in the United Kingdom still begins on 6 April. The European colonies of the Americas adopted the change when their mother countries did. In 1752, the British colonies (which as stated above adopted the New Style calendar in that year) extended as far west as the Appalachian Mountains. New France and New Spain had adopted the new calendar in 1582. In Alaska, the change took place after the United States purchased Alaska from Russia. Friday, 6 October 1867 was followed by Friday, 18 October. Instead of