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Subject: Re: strftime %Z returning empty string
Date: Thu, 31 Aug 2017 17:12:23 -0400 (EDT)
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On Thu, 31 Aug 2017, A. Wilcox wrote:

> %Z is a glibc extension.  I don't believe musl supports it.

http://pubs.opengroup.org/onlinepubs/9699919799/functions/strftime.html

     Z       Replaced by the timezone name or abbreviation, or by no bytes
             if no timezone information exists. [tm_isdst]

That "if no timezone information exists" is rather useless in my eyes. 
Exists where? Later text suggests that the TZ environment variable is 
relevant.

J. Welsh