date.cpp

// ===========================================================================
// Manipulação algébrica de datas
// Marcos Medeiros
// ===========================================================================
#include <iostream>
#include <iomanip>
#include <ctime>
#include <cstring>

using namespace std;

// Mostra uma data
void show_date(struct tm *curr_time)
{
    cout << curr_time->tm_mday << '\\' << curr_time->tm_mon + 1 << '\\' << curr_time->tm_year + 1900 << " \\\\ "
         << curr_time->tm_hour << ':' << curr_time->tm_min << ':' << curr_time->tm_sec << endl;
}

int main()
{
    time_t rawtime = time(NULL);
    struct tm *curr_time;

    curr_time = localtime(&rawtime);
    show_date(curr_time);

    cout << "Adicionando 1 dia" << endl;
    // adiciona 1 dia, 60*60*24 segundos
    rawtime += 86400;

    curr_time = localtime(&rawtime);
    show_date(curr_time);

    int year, day, mon;
    struct tm mytime;
    cout << "Ano: "; cin >> year;
    cout << "Mes: "; cin >> mon;
    cout << "Dia: "; cin >> day;


    memset(&mytime, 0, sizeof(mytime));
    mytime.tm_year = year - 1900;
    mytime.tm_mon = mon - 1;
    mytime.tm_mday = day;

    rawtime = mktime(&mytime);
    show_date(&mytime);

    rawtime += 86400;
    curr_time = localtime(&rawtime);
    show_date(curr_time);

    return 0;
}