[Tcl-bugs] [ tcl-Bugs-574573 ] clock format gets wrong timezone, once

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Bugs item #574573, was opened at 2002-06-27 15:24
Message generated for change (Comment added) made by rmax
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Category: 06. Time Measurement
Group: = 8.4a4
Status: Open
Resolution: None
Priority: 5
Submitted By: Bob Techentin (techentin)
Assigned to: Reinhard Max (rmax)
Summary: clock format gets wrong timezone, once

Initial Comment:
Tcl Versions 8.3.4 and 8.4a4.
Platform DEC Alpha OSF1 v4.0
DEC C V5.8-009 on Digital UNIX V4.0

==== clock-3.2 clock format tests FAILED
==== Contents of test case:

    # TCL_USE_TIMEZONE_VAR

    catch {set oldtz $env(TZ)}
    set env(TZ) PST
    set x {}
    append x [clock format 863800000 -format %Z -gmt 1]
    append x [set env(TZ)]
    catch {unset env(TZ); set env(TZ) $oldtz}
    set x

---- Result was:
CSTPST
---- Result should have been:
GMTPST
==== clock-3.2 FAILED

On closer inspection, it appears that [clock format] 
returns the wrong timezone only one time after changing 
the env(TZ) variable.  Subsequent calls to [clock format] 
return the proper timezone.  for example:

./tclsh
% set env(TZ)
% clock format 863800000 -format %Z -gmt 1
GMT
% set env(TZ) PST
PST
% clock format 863800000 -format %Z -gmt 1
CST
% clock format 863800000 -format %Z -gmt 1
GMT
% clock format 863800000 -format %Z -gmt 1
GMT
% 


It doesn't seem to matter if env(TZ) is set prior to 
entering tclsh.  This problem also does not appear on 
HP-UX or Win32.  Maybe it is a 64 bit thing.


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>Comment By: Reinhard Max (rmax)
Date: 2003-07-31 16:44

Message:
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Any news on this one?
Otherwise I suggest to close it.

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Comment By: Bob Techentin (techentin)
Date: 2002-07-02 23:47

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Well, if I've got the only hardware on the planet that is 
affected, then it may be difficult to figure out.  Our somewhat 
crusty alpha doesn't have a functioning debugger, so I can't 
supply any insights at this time.


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Comment By: Reinhard Max (rmax)
Date: 2002-06-29 17:54

Message:
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My changes only affect locales, not timezones, and I only
changed 8.4, not 8.3. It also doesn't happen on any of the
many 32 and 64 bit platforms I have at hand.
Maybe the systenm's strftime() function is to blame.

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Comment By: Donal K. Fellows (dkf)
Date: 2002-06-27 16:05

Message:
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Reinhard was doing something in this are recently.  (Can't
reproduce on Solaris/SPARC)

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