ref: 9910099b383e28a0a8b9b8c26ea99a5a2d77f5b3 dir: /src/libc/time/_newyear.c/
/* * Happy New Year!!!! */ int _newyear(int year) { int day; year += 1900 - 1; day = 1 + year + year/4; day -= year/100; day += year/400; return day % 7; }