[Patches] [ python-Patches-675422 ] Add tzset method to time module

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Patches item #675422, was opened at 2003-01-28 00:42
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https://sourceforge.net/tracker/?func=detail&atid=305470&aid=675422&group_id=5470

Category: Library (Lib)
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Stuart Bishop (zenzen)
Assigned to: Nobody/Anonymous (nobody)
Summary: Add tzset method to time module

Initial Comment:
Adds access to the tzset method, allowing you to change your local timezone as required. In addition to invoking the tzset system
call, the code also updates the timezone attributes (time.timezone etc). This lets you do timezone conversions amongst other things.

Also includes changes to configure.in to only build new code if the tzset method correctly switches timezones on your platform. This 
should be for all modern Unixes, and possibly other platforms.

Also includes tests in test_time.py

Docs would be along the lines of:

tzset() -- 
Initialize, or reinitialize, the local timezone to the value stored in os.environ['TZ']. The TZ environment variable should be specified in
standard Uniz timezone format as documented in the tzset man page
(eg. 'US/Eastern', 'Europe/Amsterdam'). Unknown timezones will silently fall back to UTC. If the TZ environment variable is not set, the local timezone is set to the systems best guess of wallclock time.
Changing the TZ environment variable without calling tzset *may* change the local timezone used by methods such as localtime, but this behaviour should not be relied on.

eg::

>>> now = time.time()
>>> os.environ['TZ'] = 'Europe/Amsterdam'
>>> time.tzset()
>>> time.ctime(now)
'Mon Jan 27 14:35:17 2003'
>>> time.tzname  
('CET', 'CEST')
>>> os.environ['TZ'] = 'US/Eastern'
>>> time.tzset()
>>> time.ctime(now)
'Mon Jan 27 08:35:17 2003'
>>> time.tzname
('EST', 'EDT')

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