C51单片机模块化编程万年历设计

void t0(void)interrupt 1 using 0 //t0的中断程序
{
tcnt++;
if(tcnt==4000)//定时器的定时计数，4000次250us为1秒
{
tcnt=0;
P3_3=~P3_3;
a=~a;
sec++;
if(sec==60)
{
sec=0;
min++;
if(min==60)
{
min=0;
hour++;
if(hour==24)
{
hour=0;
day++;
if(month==2&&((yearl==0&&yearh%4==0)||(yearl!=0&&yearl%4==0))&&day==30)day=1;
else if(month==2&&day==29)day=1;
else if((month==4||month==6||month==9||month==11)&&day==31)day=1;
else if(day==32)day=1;
if(day==1)
{
month++;
if(month==13)
{
month=1;
yearl++;
if(yearl==100)
{
yearl=0;
yearh++;
if(yearh==100)
{
yearh=20;
}
}
}
}
}
}
}
}
}