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bug#9614: date ignoring wrong TZ values

From: Paul Eggert
Subject: bug#9614: date ignoring wrong TZ values
Date: Tue, 1 Jan 2019 23:08:26 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

I think this implementation is heading in the wrong direction. To determine whether a time zone string FOO is valid, a program should call tzalloc (FOO) and sees whether that yields NULL. And if tzalloc doesn't work that way now, we should fix tzalloc so it does. Once that happens, 'date' can simply call tzalloc (getenv ("TZ")) to see whether the time zone setting is OK.

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