把日期和时间转换为格林尼治标准时间(GMT)

[c]代码库

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

/* Pacific Standard Time & Daylight Savings */ 
char *tzstr = "TZ=PST8PDT"; 

int main(void) 
{ 
   time_t t; 
   struct tm *gmt, *area; 

   putenv(tzstr); 
   tzset(); 

   t = time(NULL); 
   area = localtime(&t); 
   printf("Local time is: %s", asctime(area)); 
   gmt = gmtime(&t); 
   printf("GMT is:        %s", asctime(gmt)); 
   return 0; 
}