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bug#21020: 24.4; `display-time-world' tampers with TZ

From: Paul Eggert
Subject: bug#21020: 24.4; `display-time-world' tampers with TZ
Date: Sun, 26 Jul 2015 10:55:38 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0

Eli Zaretskii wrote:

test/automated/icalender-tests.el exercises the new code.

But the tests there that play with TZ are all expected failures on
MS-Windows, because they use Posix format of time-zone definition that
Windows runtime doesn't support.  So that probably means there are no
tests that could be used on Windows.

OK, didn't know that. Presumably this could be addressed by adding tests for MS-Windows TZ settings, if somebody has the time for this (pun intended...).

Also, the MS-Windows port can't entirely skip the time module any
more, as that module arranges for time.h to declare localtime_rz and

This could conflict with time.h in nt/inc/sys/, no?

I don't see why. <sys/time.h> is a different API. This patch affects only <time.h>.

lib/time.h seems to want to replace 'localtime', which might
clash with 'sys_localtime' we currently use as replacement on w32.

The replacement is conditional, and the condition should be false on w32.

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