gmtime() Function in C

Last Updated : 06 Oct, 2023

The gmtime() function in C takes a pointer to type t_time value which represents type in seconds and converts it to struct tm. In this article, we will learn gmtime() Function in the C programming language.

The struct tm type can hold the individual components of time in UTC(Universal Time Coordinated) or GMT time (i.e., the time in the GMT timezone) time zones. The C gmtime() function is defined in <ctime> header file.

Syntax of gmtime()

tm* gmtime ( const time_t* current_time )

The hours can be accessed using tm_hour
The minutes can be accessed using tm_min
The seconds can be accessed using tm_sec

Parameters

current_time: It specifies a pointer to a time_t object.

Return Value

On Success, returns a pointer to a tm object.
Otherwise, the Null pointer is returned.

Examples of gmtime()

Example 1

// C program to illustrate the gmtime() function
#include <stdio.h>
#include <time.h>
#define CST (+8)
#define IND (-5)

int main()
{

    // object
    time_t current_time;

    // pointer
    struct tm* ptime;

    // use time function
    time(&current_time);

    // gets the current-time
    ptime = gmtime(&current_time);

    // print the current time
    printf("Current time:\n");

    printf("Beijing ( China ):%2d:%02d:%02d\n",
           (ptime->tm_hour + CST) % 24, ptime->tm_min,
           ptime->tm_sec);

    printf("Delhi ( India ):%2d:%02d:%02d\n",
           (ptime->tm_hour + IND) % 24, ptime->tm_min,
           ptime->tm_sec);
    return 0;
}

Output

Current time:
Beijing ( China ):20:00:04
Delhi ( India ): 7:00:04

Example 2

// C++ program to illustrate the 
// gmtime() function 
#include <stdio.h> 
#include <time.h> 
#define UTC (0) 
#define ART (-3) 

int main() 
{ 
      // object
    time_t current_time;
      
      // pointer
    struct tm* ptime; 
      
      // use time function
    time(&current_time); 
  
      // print the current time
    ptime = gmtime(&current_time); 
    printf("Current time:\n"); 
    printf("Monrovia ( Liberia ) :%2d:%02d:%02d\n", 
        (ptime->tm_hour + UTC) % 24, ptime->tm_min, ptime->tm_sec); 

    printf("Buenos Aires ( Argentina ) :%2d:%02d:%02d\n", 
        (ptime->tm_hour + ART) % 24, ptime->tm_min, ptime->tm_sec); 
    return 0; 
}

Output

Current time:
Monrovia ( Liberia ) :11:45:36
Buenos Aires ( Argentina ) : 8:45:36

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AmanSrivastava1

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