From: grimmer AT nyx DOT cs DOT du DOT edu (Geoff Rimmer)
Date: Sun, 9 May 1993 18:13:52 -0600
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: timezone problem - help required!

I'm having trouble with timezones with my DJGPP programs.

The following program illustrates my point:

-*-*-*-*-*-*-*-*-*-*-* START -*-*-*-*-*-*-*-*-*-*
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

extern int main()
{
    char *tz=getenv("TZ");
    time_t t;
    if (tz)
        printf("TZ=\"%s\"\n",tz);
    else
        puts("TZ not set");
    time(&t);
    printf("time() = %lu\n",(unsigned long)t);
    printf("localtime() = %s",ctime(&t));
    printf("gmtime() = %s",asctime(gmtime(&t)));
    return 0;
}
-*-*-*-*-*-*-*-*-*-*-* END -*-*-*-*-*-*-*-*-*-*

The current time is Mon May 10 00:47:14 1993, according to the output
from the MSDOS 'time' command.

The output of the above program compiled with DJGPP (2.2.2, 1.08) is
as follows: 

    TZ="GMT0BST"
    time() = 736991234
    localtime() = Sun May 9 23:47:14 1993
    gmtime() = Sun May 9 23:47:14 1993

In the UK we are currently on British Summer Time (BST) which is one
hour ahead of Greenwich Mean Time (GMT).  So, shouldn't localtime()
return a time one hour later than gmtime()?  That is, shouldn't
localtime() show 'Mon May 10 00:47:14 1993'?

Any help or pointers would be very much appreciated!

Geoff
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