setting TZ is harmful

[Brian Inglis]

On 2017-05-09 08:09, Gluszczak, Glenn wrote:
> Ran into issues with TZ in the past too. ActiveState Perl is picky.
> I use the PST8PDT format for TZ, but could be other Window programs
> that won't accept that.

Default rules used for that format in tzcode are those for pre-2007 
North America, until changes coming in the next tzcode release are 
incorporated into downstream libraries, when rules will default to 
post-2007 North America. 
Many libraries, including Cygwin, use their own implementations of 
some tzcode functions, so may use different rules, or not pick up 
code updates until years later. 
Better to set up an /etc/localtime symlink to zoneinfo/.../... for 
Cygwin and let Windows programs do their own thing, which may be 
neither currently nor historically correct.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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