#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <locale.h>

void print_calendar(int year, int month)
{
    int days_in_month[] = { 31, 28 + (year % 4 == 0 && year % 100 != 0 || year % 400 == 0), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
    char* month_names[] = { "", "������", "�������", "����", "������", "���", "����", "����", "������", "��������", "�������", "������", "�������" };

    printf("%s %04d\n", month_names[month], year);
    printf("�� �� �� �� �� �� ��\n");

    int dow = get_day_of_week(year, month, 1);

    for (int i = 0; i < dow; i++)
    {
        printf("   ");
    }

    for (int day = 1; day <= days_in_month[month - 1]; day++)
    {
        printf("%2d ", day);

        if ((day + dow) % 7 == 0 || day == days_in_month[month - 1])
        {
            printf("\n");
        }
    }
}

int main()
{
    system("chcp 1251");
    setlocale(LC_ALL, "rus");

    char input[11];
    time_t t = time(NULL);

    struct tm now = *localtime(&t);
    int year = now.tm_year + 1900;
    int month = now.tm_mon + 1;
    int day = now.tm_mday;
    char now1[] = "now";

    printf("������� ���� � ������� ����.��.��, ����.��, ���� ��� now: ");
    scanf("%s", input);

    if (strcmp(input, now1) == 0)
    {
        printf("����������� ����: %04d.%02d.%02d\n", year, month, day);
    }
    else if (strlen(input) == 10 && input[4] == '.' && input[7] == '.')
    {
        struct tm new;
        new.tm_year = atoi(input);
        new.tm_mon = atoi(input + 5);
        new.tm_wday = atoi(input + 8);

        time_t�t;
        struct�tm�* p;
        char�s[80];
        char* format� = "%A�%B�%Y";
        t� = time(NULL);
        p� = gmtime(&t);
        strftime(s, 80, format, p);�
        printf("Time:�%s\n", s);
        return�0;
    }

        time_t t = mktime(timeinfo);
        char buffer[80];
        strftime(buffer, 80, "%A", localtime(&t));

        printf("���� ������: %s\n", buffer);

        int dow = get_day_of_week(year, month, day);

        switch (dow)
        {
        case 0:
            printf("���� ������ ��� ���� %s: �����������\n", input);
            break;
        case 1:
            printf("���� ������ ��� ���� %s: �����������\n", input);
            break;
        case 2:
            printf("���� ������ ��� ���� %s: �������\n", input);
            break;
        case 3:
            printf("���� ������ ��� ���� %s: �����\n", input);
            break;
        case 4:
            printf("���� ������ ��� ���� %s: �������\n", input);
            break;
        case 5:
            printf("���� ������ ��� ���� %s: �������\n", input);
            break;
        case 6:
            printf("���� ������ ��� ���� %s: �������\n", input);
            break;
        default:
            break;
        }
    }
    else if (strlen(input) == 7 && input[4] == '.')
    {
        year = atoi(input);
        month = atoi(input + 5);

        printf("��������� �� %04d.%02d:\n", year, month);
        print_calendar(year, month);
    }
    else if (strlen(input) == 4)
    {
        year = atoi(input);

        printf("��������� �� %04d:\n", year);

        for (int i = 1; i <= 12; i++)
        {
            print_calendar(year, i);
        }
    }
    else
    {
        printf("������: ������������ ������ ����\n");
        return 1;
    }
    return 0;
}