system dates

Posted on 2000-04-20
Last Modified: 2010-04-15
I am writting a C program and I need to display the current system date.  What is the syntax, what header file do I need etc...
Question by:abeveridge
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Expert Comment

ID: 2736742
One way...

#include <time.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/timeb.h>
#include <string.h>

void main()
  time_t ltime;

  time( &ltime );
  printf( "Time in seconds since UTC  1/1/70:\t%ld\n", ltime );
  printf( "time and date:\t\t\t%s", ctime( &ltime ) );


Accepted Solution

kishore_joshi earned 75 total points
ID: 2737061
check out this simple example to get the system date and time.....

#include <stdio.h>
#include <time.h>

int main(void)
  time_t t;

  t = time(NULL);

  printf("Current date is %s", ctime(&t));

  t -= 24L*60L*60L;  /* Back up to same time previous day */

  printf("\nNew date is %s", ctime(&t));

  return 0;
LVL 84

Expert Comment

ID: 2737073
/* Back up to same time previous day */
Assuming no daylight savings switch

Expert Comment

ID: 2825050
As Ozo and Kishori Joshi put it, the answer of your question can be put in this way. And you can even see the output of this program from the output file.

 #include <stdio.h>
 #include <time.h>
 #include <stdlib.h>
 #include <string.h>

long int        time();
char           *ctime();
  FILE *fp, *fopen();
int main(void)

  time_t clock;

  clock = time(NULL);
        fp = fopen("goandsee", "w");
        if((fp = fopen("goandsee", "w")) == NULL){
        printf("Error for writing output file.\n");

  fprintf(fp, "Current date is %s", ctime(&clock));

  clock -= 24L*60L*60L;  /* Back up to same time previous day */

  fprintf(fp, "\n New date is %s", ctime(&clock));

  return 0;


Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Preface I don't like visual development tools that are supposed to write a program for me. Even if it is Xcode and I can use Interface Builder. Yes, it is a perfect tool and has helped me a lot, mainly, in the beginning, when my programs were small…
Summary: This tutorial covers some basics of pointer, pointer arithmetic and function pointer. What is a pointer: A pointer is a variable which holds an address. This address might be address of another variable/address of devices/address of fu…
The goal of this video is to provide viewers with basic examples to understand opening and writing to files in the C programming language.
The goal of this video is to provide viewers with basic examples to understand and use switch statements in the C programming language.
Suggested Courses

732 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question