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From: mathew@mantis.co.uk (mathew)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Time Zones: A Plea for Standards?
Message-ID: <No5H110w164w@mantis.co.uk>
Date: 16 Apr 91 14:56:22 GMT
References: <1991Apr15.200244.7775@cc.curtin.edu.au>
Organization: Mantis Consultants, Cambridge. UK.
Lines: 39

nmurrayr@cc.curtin.edu.au (Ron Murray) writes:
>    While it's nice to see that programmers are beginning to realise that ther
> IS life outside their own country / timezone, it would be nice if they could
> find some way of specifying this timezone without using a TZ environment
> variable.

The TZ environment variable is part of MS-DOS. Programs should not use it
directly, but should use the supplied MS-DOS calls, as in the following MSC
program:

#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]);
}

Any program which looks at TZ directly is evil and rude, and should not be
tolerated.


mathew
[ GMT0BST ]

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