The TZ program included here came from a UK user who was 
wrestling with setting the TZ variable outside the US.

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From: mathew@mantis.co.uk (mathew)
Newsgroups: comp.infosystems.www
Subject: Re: SOLVED: Setting TZ for Win httpd 1.1a7
Date: 5 May 1994 12:20:10 +0100
Organization: Mantis Consultants Ltd, Cambridge, UK
Lines: 246
Message-ID: <2qakpa$mf8@sunforest.mantis.co.uk>
References: <RobertStocks.4.000C1151@symantec.com> 
  <2q8t7a$1kn@vixen.cso.uiuc.edu>
  <balin.76.000F43E7@vt.edu>
  <rdennyCpBJ5p.H2p@netcom.com>
[...]

For the benefit of UK users, I'll point out that TZ=GMT0BST is *not*
correct for the UK.  MS-DOS assumes that everyone changes time zone at
the same date as the USA.

For British Summer Time, the correct setting is TZ=BST-1

For Greenwich Mean Time, the correct setting is TZ=GMT0

You have to manually change setting twice a year.  Don'cha just love
MS-DOS, eh?

The following Microsoft C program will let you check that you've got
the right settings:

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

int _daylight;
long _timezone;
char *_tzname[];

main()
{
   time_t tnow;

   time(&tnow);
   printf("    Local time is %s\n",asctime(localtime(&tnow)));
   printf("Universal time is %s\n",asctime(gmtime(&tnow)));
   _tzset();
   printf("Daylight savings time flag = %d\n", _daylight);
   printf("Time offset = %ld\n", _timezone);
   printf("Time zone = %s\n", _tzname[0]);
}

The binary is attached, as it's only small.


mathew