不打铃，时钟显示很奇怪

#include <reg51.h>
#define uchar unsigned char
sbit b1=P2^0;
sbit b2=P2^1;
sbit b3=P2^2;
sbit b4=P2^3;
sbit b5=P2^4;
sbit b6=P2^5;
sbit b7=P2^6;
sbit b8=P2^7;
sbit beep=P1^0;
sbit k1=P1^2;
sbit k2=P1^5;
sbit d1=P1^7;
unsigned char s=0,m,h,day;
unsigned char f=0;
unsigned char code a[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x27,0x7f,0x6f};
void chushi(void)
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
ET0=1;
EA=1;
TR0=1;
}
void change()
{
if(k1==0)
{
EA=0;
m++;
}
if(k2==0)
{
h++;
}
EA=1;
}
void time(void) interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
f++;
if(f==20)
{
f=0;
s++;
if(k1==0)
s=60;
if(k2==0)
{
h++;
if(h>23)
{
h=0;
day++;
}
}
if(h>23)
h=0;
if(s>59)
{
s=0;
m++;
}
if(m>59)
{
m=0;
h++;
}
if(h>23)
{
h=0;
day++;
}
if(day>7)
{
day=0;
}
}
}
void ys(char x)
{
char hk;
for(x;x>0;x--)
{
for(hk=200;hk>0;hk--)
{}
}
}

void display()
{
uchar s1,s2,m1,m2,h1,h2,day1;
s1=s/10;s2=s%10;m1=m/10;m2=m%10;h1=h/10;h2=h%10;day1=day%10;
P0=a[s1];b7=0;ys(10);b7=1;
P0=a[s2];b8=0;ys(10);b8=1;
P0=0x40;b6=0; ys(10);b6=1;
P0=a[m1];b4=0;ys(10);b4=1;
P0=a[m2];b5=0;ys(10);b5=1;
P0=0x40;b3=0;ys(10);b3=1;
P0=a[h1];b1=0;ys(10);b1=1;
P0=a[h2];b2=0;ys(10);b2=1;
P3=a[day1];
if(day==1&&day<6)
{
if(h==8&&m==0&&m<1) {beep=0;}
if(h==8&&m==45&&m<46) {beep=0;}
if(h==8&&m==55&&m<56) {beep=0;}
if(h==9&&m==40&&m<41) {beep=0;}
if(h==10&&m==10&&m<11) {beep=0;}
if(h==10&&m==55&&m<56) {beep=0;}
if(h==11&&m==5&&m<6) {beep=0;}
if(h==11&&m==50&&m<51) {beep=0;}
if(h==14&&m==0&&m<1) {beep=0;}
if(h==14&&m==40&&m<41) {beep=0;}
if(h==14&&m==55&&m<56) {beep=0;}
if(h==15&&m==40&&m<41) {beep=0;}
if(h==16&&m==10&&m<11) {beep=0;}
if(h==16&&m==55&&m<56) {beep=0;}
if(h==17&&m==5&&m<6) {beep=0;}
if(h==17&&m==50&&m<51) {beep=0;}
}
beep=1;
}

void main()
{
m=30;
h=8;
s=55;
day=1;
chushi();
while(1)
{
display();
}
}
我是跟着步骤来，都没有报错，不打铃，时分秒和正常时钟显示很奇怪，一秒一个小时，分钟应该是正常的