C语言如何计算生存天数？？？

要求输入出生年月日，输出截止到2007年3月1日的生存天数，哪位高手给解一下．．．

日子算尾不算头.日期请用公历(农历我不会算).代码:(已调试)

*********************************************************************************************************************

int U,V,X,D,T,L;

int moon()

{switch(V)

{case 1:X++;break;

case 2:T++;if(!(U%400)||!(U%4)&&U%100) L++;break;

case 3:D++;break;

case 4:X++;break;

case 5:D++;break;

case 6:X++;break;

case 7:D++;break;

case 8:D++;break;

case 9:X++;break;

case 10:D++;break;

case 11:X++;break;

case 12:D++,U++,V=0;break;

default:printf("MonthDigit error...I maked mon=%d!",V=12);}}

main()

{int W,a,b,c;

printf("\nWhat's your birthday(year mon day): ");

scanf("%d %d %d",&U,&V,&W);

printf("\nWhat day is it today(year mon day): ");

scanf("%d %d %d",&a,&b,&c);

for(;U<a;V++) moon();

for(;U==a&&V<b;V++) moon();

if(U>a||V>b||c<W) printf("You haven't both yet!");

else printf("You have been Live %d Days.",31*D+30*X+28*T+L-W+c);

scanf("%*c%*c");}

**********************************************************************************************************************