/****************************************************************************** * Compilation: javac DayOfWeek.java * Execution: java DayOfWeek m d y * * Read in the month (m), day (d), and year (y) and print out what * day of the week it falls on according to the Gregorian calendar. * For M use 1 for January, 2 for February, and so forth. Outputs * 0 for Sunday, 1 for Monday, and so forth. * * y0 = y - (14 - m) / 12 * x = y0 + y0/4 - y0/100 + y0/400 * m0 = m + 12 * ((14 - m) / 12) - 2 * d = (d + x + (31*m0)/12) mod 7 * * * % java DayOfWeek 8 2 1953 // August 2, 1953 * 0 // Sunday * * % java DayOfWeek 1 1 2000 // January 1, 2000 * 6 // Saturday * ******************************************************************************/ public class DayOfWeek { public static void main(String[] args) { int m = Integer.parseInt(args[0]); int d = Integer.parseInt(args[1]); int y = Integer.parseInt(args[2]); int y0 = y - (14 - m) / 12; int x = y0 + y0/4 - y0/100 + y0/400; int m0 = m + 12 * ((14 - m) / 12) - 2; int d0 = (d + x + (31*m0)/12) % 7; System.out.println(d0); } }