🚀 go-pugleaf

Did you receive that info on the first of april?

-- 

Eric P. van Westendorp  Tel: +31(0252)210579
Reigerslaan 22  2215NN Voorhout  Netherlands

Jim Backus wrote:
> It seems that MSDOS 6.x is aware of time zones. If the environment 
> variable TZ is not set, it apparently assumes that it is operating 
> under Pacific time zone. I haven't fully explored how this version of 
> MSDOS uses the time zone information - it doesn't change the date and 
> time, but it does have an effect on programmes that are time 
> sensitive.
> 
> If anyone here has any detailed knowledge on what this version of DOS 
> does with the TZ variable, could you post it? All I could find on the 
> web related to operation of PGP and time stamping of usenet messages.
> 
> TIA
> 

On Thu, 10 Apr 2003 19:31:37 +0000 (UTC), JHB@jita.nospam.demon.co.uk
(Jim Backus) wrote:

>It seems that MSDOS 6.x is aware of time zones. If the environment 
>variable TZ is not set, it apparently assumes that it is operating 
>under Pacific time zone. I haven't fully explored how this version of 
>MSDOS uses the time zone information - it doesn't change the date and 
>time, but it does have an effect on programmes that are time 
>sensitive.
>
>If anyone here has any detailed knowledge on what this version of DOS 
>does with the TZ variable, could you post it? All I could find on the 
>web related to operation of PGP and time stamping of usenet messages.

   The answer is "very little".  Few progs knew how to check the TZ
variable, and, to make it worse, M$ tended to format this in a
non-standard way.

   IMHO, unless you are running an app that *very clearly* states what
it is expecting from TZ (eg Demon's old version of KA9Q) do *NOT*
expect anything to get it right. This includes most M$ apps.

   MS-DOS was **** at timezones, chiefly because M$ didn't understand
them.  The nasty legacy is still with us now.

   Why is this important?  There are better/other ways of dealing with
this.  The most useful is to set the PC clock to localtime, as this is
what nearly all M$ apps of that era expected.

   Regards,
         Harry.

Well, I have met this problem too, I will post my question below your
subject.

"Jim Backus" <JHB@jita.nospam.demon.co.uk> wrote in message
news:vdCZ2p92dNiH-pn2-2EyklhxUdMUQ@localhost...
> It seems that MSDOS 6.x is aware of time zones. If the environment
> variable TZ is not set, it apparently assumes that it is operating
> under Pacific time zone. I haven't fully explored how this version of
> MSDOS uses the time zone information - it doesn't change the date and
> time, but it does have an effect on programmes that are time
> sensitive.
>
> If anyone here has any detailed knowledge on what this version of DOS
> does with the TZ variable, could you post it? All I could find on the
> web related to operation of PGP and time stamping of usenet messages.
>
> TIA
>
> --
> Jim Backus  OS/2 user
> bona fide replies to jimb-thecirclethingy-jita-dp-demon-dp-co-dp-uk
> remove dashes and make the obvious substitutions for valid email
> address
> http://www.jita.demon.co.uk

JRS:  In article <vdCZ2p92dNiH-pn2-2EyklhxUdMUQ@localhost>, seen in
news:demon.tech.pc, Jim Backus <JHB@jita.nospam.demon.co.uk> posted at
Thu, 10 Apr 2003 19:31:37 :-
>It seems that MSDOS 6.x is aware of time zones. If the environment 
>variable TZ is not set, it apparently assumes that it is operating 
>under Pacific time zone. I haven't fully explored how this version of 
>MSDOS uses the time zone information - it doesn't change the date and 
>time, but it does have an effect on programmes that are time 
>sensitive.
>
>If anyone here has any detailed knowledge on what this version of DOS 
>does with the TZ variable, could you post it? All I could find on the 
>web related to operation of PGP and time stamping of usenet messages.

DOS knows nothing of TZ.

UNIX & C libraries and utilities, because of their origin, may well
default to California time; and may even be settable for other US time
zones - after all, nowhere else matters.

DOS translations of UNIX & C code are likely to inherit existing
defects; and may only have those parts needed for the place of
translation translated.  The GAWK that I was interested in, for example,
would accept a TZ string; but it ignored the change-date rules provided,
using only the Merkin ones.

Some programs written for DOS use these libraries - a program which goes
silly from 2038-01-19 can be assumed to do so.

 <URL:http://www.merlyn.demon.co.uk/misctime.htm#TZ>
 <URL:http://www.merlyn.demon.co.uk/js-date5.htm#DDTA>
 
-- 
� John Stockton, Surrey, UK.  jrs@merlyn.demon.co.uk   Turnpike v4.00   MIME. �
 Web  <URL:http://www.merlyn.demon.co.uk/> - FAQish topics, acronyms, & links.
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 Do not Mail News to me. Before a reply, quote with ">" or "> " (SonOfRFC1036)

Jim Backus wrote:
> 
> It seems that MSDOS 6.x is aware of time zones. If the environment
> variable TZ is not set, it apparently assumes that it is operating
> under Pacific time zone. I haven't fully explored how this version of
> MSDOS uses the time zone information - it doesn't change the date and
> time, but it does have an effect on programmes that are time
> sensitive.
> 
> If anyone here has any detailed knowledge on what this version of DOS
> does with the TZ variable, could you post it? All I could find on the
> web related to operation of PGP and time stamping of usenet messages.
> 
> TIA
> 
> --
> Jim Backus  OS/2 user
> bona fide replies to jimb-thecirclethingy-jita-dp-demon-dp-co-dp-uk
> remove dashes and make the obvious substitutions for valid email
> address
> http://www.jita.demon.co.uk

I doubt DOS is actually "aware" of anything - you can set any variable
you want to under DOS. The only program I know of that actually uses the
TZ variable is Netscape. I presume MSIE does the same on a DOS/Win 3.x
machine.

Just do a google search using "set TZ=" and you can find all the
references you need for the variable settings.

On Sat, 12 Apr 2003 00:54:31 -0300, Rick <rickajho@rcn.com>
wrote:

> The only program I know of that actually uses the
>TZ variable is Netscape. 

I can add, at least, two others: Pretty Good Privacy (DOS-based)
and NetDate (Win3.1x-based).

WBR,
Artur

Artur Yelchishchev  <risico@hot.ee> wrote in message news:<9bqf9v8jqvvv9jo1vkhvuodav8jgbac7s7@4ax.com>...
> On Sat, 12 Apr 2003 00:54:31 -0300, Rick <rickajho@rcn.com>
> wrote:
> 
> > The only program I know of that actually uses the
> >TZ variable is Netscape. 
> 
> I can add, at least, two others: Pretty Good Privacy (DOS-based)
> and NetDate (Win3.1x-based).

Current versions of Info-Zip's ZIP.EXE and UNZIP.EXE also use it,
unfortunately.

-- 
Charles Dye     raster@highfiber.com

In article <3E978DF7.9BE350A7@rcn.com>, Rick wrote:
> Jim Backus wrote:
>> 
>> It seems that MSDOS 6.x is aware of time zones. If the environment
>> variable TZ is not set, it apparently assumes that it is operating
>> under Pacific time zone. I haven't fully explored how this version of
>> MSDOS uses the time zone information - it doesn't change the date and
>> time, but it does have an effect on programmes that are time
>> sensitive.
>> 
>> If anyone here has any detailed knowledge on what this version of DOS
>> does with the TZ variable, could you post it? All I could find on the
>> web related to operation of PGP and time stamping of usenet messages.
> 
> I doubt DOS is actually "aware" of anything - you can set any variable
> you want to under DOS. The only program I know of that actually uses the
> TZ variable is Netscape. I presume MSIE does the same on a DOS/Win 3.x
> machine.
> 
> Just do a google search using "set TZ=" and you can find all the
> references you need for the variable settings.

Probably all DJGPP based programs do also.

On 12 Apr 2003 12:55:03 -0700, raster@highfiber.com (Charles Dye)
wrote:

[ TZ variable ]
>Current versions of Info-Zip's ZIP.EXE and UNZIP.EXE also use it,
>unfortunately.

Why 'unfortunately'? :-) Generally, I have no problems with
'TZ-aware' applications...

WBR,
Artur

Artur Yelchishchev  <risico@hot.ee> wrote in message news:<8krk9voa42l0e2p5c0f7ef6602j0orq0bp@4ax.com>...
> On 12 Apr 2003 12:55:03 -0700, raster@highfiber.com (Charles Dye)
> wrote:
> 
> [ TZ variable ]
> >Current versions of Info-Zip's ZIP.EXE and UNZIP.EXE also use it,
> >unfortunately.
> 
> Why 'unfortunately'? :-) Generally, I have no problems with
> 'TZ-aware' applications...

"Unfortunately" because time stamps in DOS .ZIP archives
traditionally refer to _local_ times, not GMT.


A quick browse through the MS-DOS 7.1 kernel reveals a few
strings which appear to be names of environment variables.  TZ
doesn't seem to be among them.  Other versions of DOS will
differ, but MS-DOS 7.1 seems interested in:

   CONFIG=
   TMP= and TEMP=
   TEMPPROMPT= or perhaps \TEMPPROMPT=   (?)
   winbootdir=
   PATH=
   COMSPEC=

I'm guessing that some of these are simply set at boot time
for use by the default command shell, and never referenced
by DOS thereafter.

-- 
Charles Dye     raster@highfiber.com