Date Class

I found this code that pretty much does exactly what I want. (minus forcing the change of a date) but I don't understand it to be able to produce a similar one.

Code:

---

#include <iostream>
#include <ctime>
using namespace std;

//Date class
class Date
{
public:
      Date(int DDD, int YYYY);                    //constructor for DDD YYYY overloaded Dateone()
      Date(int MM, int DD, int YY);              //constructor for MM/DD/YY overloaded Datetwo)
      Date(char data[20]);
private:
    int day;
    int month;
    int year;
    char mon;

};
Date::Date(int DDD, int YYYY)
{
    day = DDD;
    year = YYYY;
    cout << day << " " << year << "\n";
}

Date::Date(int MM, int DD, int YY)
{
    day = DD;
    month = MM;
    year = YY;
    cout << month << "/" << day << "/" << year << "\n";

}



Date::Date(char data[20])
{

       

    cout << data << "\n";
}
int main(void)
{

        struct tm *t;
        int day, mon, year;
        char *month[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
        char date[100];
        time_t rawtime;

        time ( &rawtime );
        cout << ( "Current date and time are: ", ctime (&rawtime) );

      t = localtime(&rawtime);

        day = t->tm_mday;
        mon = t->tm_mon + 1;
        year = t->tm_year + 1900;
        sprintf(date, "%s %d, %d", mon[mon - 1], day, year);

        Date One(day, year);
        Date Two(mon, day, year);
        Date Three(date);

        return 0;
}

---

I don't understand the purpose of this 'data' function tho it doesnt work without it.
Also its my first time using ctime so I dont understand the main much.. please correct me if I'm wrong
so from

Code:

---

time_t rawtime;

        time ( &rawtime );
        cout << ( "Current date and time are: ", ctime (&rawtime) );

      t = localtime(&rawtime);

        day = t->tm_mday;
        mon = t->tm_mon + 1;
        year = t->tm_year + 1900;
        sprintf(date, "%s %d, %d", mon[mon - 1], day, year);

---

is all necessary to get the pc time and display it? if I just want the pc to know I would delete after the t= part cus the rest is basically just setting it up to print right?

I dont understand the purpose of the struct in the main nore the char date either..

currently my code i'm developing is

Code:

---

#include <iostream>
#include <ctime>
using namespace std;

class Date {

private:
  int day;
  int month; 
  int year; 
public:
  Date();
  Date( int,int,int);
  void FormatTime();
  void print();
};
Date::Date( int m, int d, int yr )
{
    if ( m > 0 && m <= 12 )  // validate the month (Jan-Dec)
        month = m;
    else {                   
      month = 1;
      cout << "Month " << m << " invalid. Set to month 1.\n";
          }

    if ( d > 0 && d <= 31 )  // validate the day (0-31)
        day = d;
    else {                   
      day = 1;
      cout << "day " << d << " invalid. Set to day 1.\n";
          }
    year = yr; 
       
}

void Date::FormatTime()
{
    //in hear change number into an actual month (1-january)
}


void Date::print()
{
    cout << month<<"/"<<day<<"/"<<year <<endl; // mm/dd/year
        cout << day <<", "<< year << endl;  //dd year

}


int main()
{
   
}

---

I was doing it so that the user puts in the date but then I realized the question says "read about <ctime> and implement it. Which would make my code all useless cus I'm suppose to be using the pc time...

Any tips/help is appreciated

Thanks!

Eh, where to start...
OK, first off, the Date(char data[20]) constructor is incomplete it seems. My guess it that it takes in a date in string form (similar to the constructor that takes year, month and date).
As for the main function, here's a breakdown:

Code:

---

int main(void)
{

        struct tm *t; // Struct to hold date
        int day, mon, year;
        char *month[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
        char date[100];
        time_t rawtime;

        time ( &rawtime ); // Gets the current time and stores it in rawtime.
        cout << ( "Current date and time are: ", ctime (&rawtime) );

      t = localtime(&rawtime); // Converts the raw time to local time (time zone thingys) and returns a tm struct with the date.

      // Takes the date and converts it to a "real" date.
      // The tm struct begins counting years from 1900 and days are relative to 0, so the first day in a month is 0, not 1.
      // Lastly prints the date.
        day = t->tm_mday;
        mon = t->tm_mon + 1;
        year = t->tm_year + 1900;
      // The -1 is to adjust the month value to an index for the month array and print the month name in that index.
        sprintf(date, "%s %d, %d", mon[mon - 1], day, year);

      // Construct date classes from the year.
        Date One(day, year);
        Date Two(mon, day, year);
        Date Three(date);

        return 0;
}

---

Also, the date is printed twice. The first two lines should get the date.
The second is a little more verbose and allows you to format it a little better, not to mention it's in a much easier format.
And also, this:
Date( int,int,int);
Don't remove the names there!
http://sourceforge.net/apps/mediawik...arameter_names

Boost also has a date class you can look into.

There is a very nice Date (or maybe Date/Time) class available for free on snippets.org...it is a "kitchen sink" class so you may want to trim it down for your purposes but I have used it in the past and found it quite nice...

Boost is known quality and portable, so that's where I would look first for reusable code.