Initial import of libucore

src/ucore_dayofweek.c

@@ -0,0 +1,18 @@
+int 
+uc_day_of_week(int day, int month, int year)
+{
+	int cent;
+
+	/* adjust months so February is the last one */
+	month -= 2;
+	if (month < 1) {
+		month += 12;
+		--year;
+	}
+	/* split by century */
+	cent = year / 100;
+	year %= 100;
+	return ((26 * month - 2) / 10 + day + year
+			   + year / 4 + cent / 4 + 5 * cent) % 7;
+}
+