Determination of the day of the week not a Gregorian leap year, (but 19 in the Julian column indicates that it "is" a Julian leap year, as are all Julian "x"00 years). 20 indicates that 2000 is a leap year. Use Jan and Feb only in leap years. For determination of the day of the week (1 January 2000, Saturday) For determination of the dominical letter (2000, BA) For determination of the doomsday (2000, Tuesday) Note that the date (and hence the day of the week) in the Revised Julian and Gregorian calendars is the same from 14 October 1923 to 28 February AD 2800 inclusive and
World Day for Laboratory Animals and other groups opposed to animal research have claimed that World Day For Animals In Laboratories is recognised by the United Nations. However, the day is not included on the official list of United Nations observances. World Day for Laboratory Animals World Day For Animals In Laboratories (WDAIL) (also known as World Lab Animal Day) is observed every year on 24 April. The surrounding week has come to be known as "World Week for Animals In Laboratories". The National Anti-Vivisection Society (NAVS) describe the day as an "international day of commemoration" for animals in laboratories. World Day For Animals In