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Showing content from http://www.cplusplus.com/reference/ctime/gmtime/ below:

function

<ctime>

gmtime 
struct tm * gmtime (const time_t * timer);

Convert time_t to tm as UTC time

Uses the value pointed by timer to fill a tm structure with the values that represent the corresponding time, expressed as a UTC time (i.e., the time at the GMT timezone).

For a local time alternative, see localtime.



Parameters
timer
Pointer to an object of type time_t that contains a time value.
time_t is an alias of a fundamental arithmetic type capable of representing times as returned by function time.

Return Value A pointer to a tm structure with its members filled with the values that correspond to the UTC time representation of timer.

The returned value points to an internal object whose validity or value may be altered by any subsequent call to gmtime or localtime.



Example 
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/* gmtime example */
#include <stdio.h>      /* puts, printf */
#include <time.h>       /* time_t, struct tm, time, gmtime */

#define MST (-7)
#define UTC (0)
#define CCT (+8)

int main ()
{
  time_t rawtime;
  struct tm * ptm;

  time ( &rawtime );

  ptm = gmtime ( &rawtime );

  puts ("Current time around the World:");
  printf ("Phoenix, AZ (U.S.) :  %2d:%02d\n", (ptm->tm_hour+MST)%24, ptm->tm_min);
  printf ("Reykjavik (Iceland) : %2d:%02d\n", (ptm->tm_hour+UTC)%24, ptm->tm_min);
  printf ("Beijing (China) :     %2d:%02d\n", (ptm->tm_hour+CCT)%24, ptm->tm_min);

  return 0;
}

Output: 
Current time around the World:
Phoenix, AZ (U.S.) :    8:22
Reykjavik (Iceland) :  15:22
Beijing (China) :      23:22


Data races The function accesses the object pointed by timer.
The function also accesses and modifies a shared internal object, which may introduce data races on concurrent calls to gmtime and localtime. Some libraries provide an alternative function that avoids this data race: gmtime_r (non-portable).

Exceptions (C++)No-throw guarantee: this function never throws exceptions.

See also
asctime
Convert tm structure to string (function)
ctime
Convert time_t value to string (function)
localtime
Convert time_t to tm as local time (function)
mktime
Convert tm structure to time_t (function)
time
Get current time (function)

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