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大全 de Exemplos de Programação C Biblioteca de C <math.h>

C library function gmtime() usage and example

Biblioteca de C - <time.h>

C library function struct tm *gmtime(const time_t *timer) Using timer Fill the value tm The structure, and represented by Coordinated Universal Time (UTC), also known as Greenwich Mean Time (GMT).

Declaration

Below is the declaration of the gmtime() function.

struct tm *gmtime(const time_t *timer)

Parameter

timeptr -- This is a pointer to a representation of the calendar time in the form of a time_t value.

Return value

This function returns a pointer to a tm structure that contains filled time information. Below are the details of the timeptr structure:

Example

struct tm {
   int tm_sec;         /* Second, ranging from 0 to 59                */
   int tm_min;         /* Minute, ranging from 0 to 59                */
   int tm_hour;        /* Hour, ranging from 0 to 23                */
   int tm_mday;        /* Day of the month, ranging from 1 to 31                    */
   int tm_mon;         /* Month, ranging from 0 to 11                */
   int tm_year;        /* Since 19Years since 00                */
   int tm_wday;        /* Day of the week, ranging from 0 to 6                */
   int tm_yday;        /* Day of the year, ranging from 0 to 365                    */
   int tm_isdst;       /* Daylight Saving Time                        */    
};

Online example

The following example demonstrates the usage of the gmtime() function.

Example

#include <stdio.h>
#include <time.h>
#define BST (+1)
#define CCT (+8)
int main ()
{
   time_t rawtime;
   struct tm *info;
   time(&rawtime);
   /* Get GMT time */
   info = gmtime(&rawtime );
   printf("Current world clock: 
");
   printf("London: %2d:%02d\n", (info->tm_hour+BST)%24, info->tm_min);
   printf("China: %2d:%02d\n", (info->tm_hour+CCT)%24, info->tm_min);
   return(0);
}

Vamos compilar e executar o programa acima, o que produzirá o seguinte resultado：

O relógio mundial atual：
Londres：14:10
China：21:10

Biblioteca de C - <time.h>

大全 de Exemplos de Programação C Biblioteca de C <math.h>