C Language | Date and Time Inbuilt Functions

To fetch the system date and display.

In order to fetch date from the system we use a system defined structure named “date”.

Function used :

getdate():

This function helps us to fetch system date and store in a date type variable
header file: dos.h

setdate():

This function helps us to modify the system date by the date stored in a date type variable.
header file: dos.h

Structure of the date as used by these functions:
getdate()
setdate()

struct date {
int da_year; current year
char da_day; day of the month
char da_mon; month (1 = Jan)
};

/* Program developed in Turboc3 */
/* getdate() Gets DOS system date
header file: dos.h */
/*
Structure of the date as used by these functions:
  getdate()
  setdate()

  struct date {
    int da_year;     current year
    char da_day;     day of the month
    char da_mon;     month (1 = Jan)
  };
  */
#include <dos.h>
#include <stdio.h>
#include<conio.h>
void main()
{
   struct date d;
   getdate(&d);
   clrscr();
   printf("The current year is: %d\n", d.da_year);
   printf("The current day is: %d\n", d.da_day);
   printf("The current month is: %d\n", d.da_mon);

   printf("date is : %d-%d-%d\n",d.da_day,d.da_mon,
   d.da_year);
getch();
}

Program to show system date and then asks the user to change the date from within the program. Then display the changed date.

/* Program developed in Turboc3 */
/*
Program to display System Date and
allow the user to modify the System Date
*/
#include<conio.h>
#include<stdio.h>
#include<dos.h>
void main()
{
   struct date d1,d2;
   int d,m,y;
   clrscr();
   getdate(&d1);
   printf("date is (dd-mm-yy) : %d-%d-%d\n",
		d1.da_day,d1.da_mon,d1.da_year);

   printf("Enter new date\n");
   printf("Enter day :");scanf("%d",&d);
   printf("Enter month : ");scanf("%d",&m);
   printf("Enter year : ");scanf("%d",&y);

   d2.da_year = y;
   d2.da_day = d;
   d2.da_mon = m;
   setdate(&d2);
   printf("Date after setting:\n");
   getdate(&d1);
   printf("date is (dd-mm-yy) : %d-%d-%d\n",
		d1.da_day,d1.da_mon,d1.da_year);
   getch();
}

Program to display system date and time
and program to calculate sum of two numbers(Any Program)

/* Program developed in Turboc3 */
#include<conio.h>
#include<stdio.h>
#include<dos.h>
void show_date_time()
{
   struct  time t;
   struct date d1;
   getdate(&d1);
   gotoxy(10,3);
   printf("Todays date is (dd-mm-yy) : %d-%d-%d\n",
		d1.da_day,d1.da_mon,d1.da_year);
   gotoxy(10,4);
   gettime(&t);
   printf("Todays time is:%2d:%02d:%02d.%02d\n",
	t.ti_hour, t.ti_min, t.ti_sec, t.ti_hund);
   printf("\n\n\n");
}
void sum()
{
  int a,b,c;
   printf("Enter 2 numbers ");
   scanf("%d %d",&a,&b);
   c=a+b;
   printf("Sum = %d\n",c);
}
void main()
{
  clrscr();
  show_date_time();
  sum();
  getch();
}