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
Determination of the day of the week example, that January 1995 is to be treated as month 13 of 1994. The formula for the Gregorian calendar is where The only difference is one between Zeller’s algorithm () and the Gaussian algorithm (), that is . So we can get the values of months from those for the Gaussian algorithm by adding one: In a partly tabular method by Schwerdtfeger, the year is split into the century and the two digit year within the century. The approach depends on the month. For , so is between 0 and 99. For , The formula for the day of the