Вывод на экран текущего месяца с кнопками и полями смены года

#include <stdio.h>
#include <time.h>
 
int main()
{   time_t now;
    struct tm * timeinfo;
    int year, m, i, j;
    char* month[] = { "January","February", "March","April", "May","June", 
            "July", "August","September","October", "November","December"};
    
    printf ("YEAR: "); scanf ("%d",&year);
    time (&now); //get current timeinfo and modify it to the user's choice
    timeinfo = localtime (&now);
    timeinfo->tm_year = year-1900; //years numerated from 1900
    timeinfo->tm_mon = 0;
 
    m =-1;
while(m<12)
{   for(i=1; i<33; i++) //year days with "overload"
    {   timeinfo->tm_mday = i;
        mktime (timeinfo); //call mktime: the whole timeinfo for the day will be set 
 
        if(timeinfo->tm_mon > m) //"end month" event, "overload" processing
        {   printf("\n                        %s\n",month[timeinfo->tm_mon]);
            printf("_______________________________\n");
            printf("  Su  Mo  Tu  We  Th  Fr  Sa\n");
            printf("_______________________________\n");
            for(j=0;j<(timeinfo->tm_wday);j++)
                printf("    ");
            m++;
            break;
        }
        if (m==11 && timeinfo->tm_mon ==0) //"end year" event
        {   m++;
            break;
        }
        
        printf("%4d",timeinfo->tm_mday); //routine
            
        if(timeinfo->tm_wday==6)//"end week" event
            printf("\n");
    }
}
    getchar();getchar();
    return 0;
}

#include <stdio.h>
#include <time.h>
 
int main()
{   time_t now;
    struct tm * timeinfo;
    
    int year, m, i, j;
    char* month[] = { "January","February", "March","April", "May","June", 
        "July", "August","September","October", "November","December"}; 
   
    printf("Calendar for given month and year. ");
    printf("Month: values from 1 to 12; year: from 1970\n");
    printf("Sample: 5.1998 or 12.2022\n");
 
    do
    {   printf ("Month.Year : "); scanf ("%d.%d",&m,&year);
    }   while(!(m>0 && m<13 && year>1970));
 
     
    time (&now); //get current timeinfo and modify it to the user's choice
    timeinfo = localtime (&now);
    timeinfo->tm_year = year-1900; //years numerated from 1900
    timeinfo->tm_mon = m-1;
 
    printf("\n                        %s, %d\n",month[m-1], year);
    printf("_______________________________\n");
    printf("  Su  Mo  Tu  We  Th  Fr  Sa\n");
    printf("_______________________________\n");
    
                
    for(i=1; i<32; i++) //year days with "overload"  
            {  
 
        timeinfo->tm_mday = i;
        mktime (timeinfo);//call mktime: the whole timeinfo for the day will be set 
 
        if(timeinfo->tm_mon == m)
            break;
 
        if(i==1)
        {   for(j=0;j<(timeinfo->tm_wday);j++) 
            printf("    ");
        }
                         
        printf("%4d",timeinfo->tm_mday); //routine
                
        if(timeinfo->tm_wday==6)
                printf("\n"); 
        
             }
     
    getchar();getchar(); 
    return 0;
}