int getweek(int y,int m,int d) { int x; if(m==1||m==2) m+=12,y--; if(y<1752||y==1752&&m<9||y==1752&&m==9&&d<3) x=(d+2*m+3*(m+1)/5+y+y/4+5)%7; else x=(d+2*m+3*(m+1)/5+y+y/4-y/100+y/400)%7; return x+1; }
原文：https://www.cnblogs.com/kannyi/p/9121615.html