bin/56042: Timezone names bugs in parsedate(3) manual page

[netbsd%eq.cz@localhost]

>Number:         56042
>Category:       bin
>Synopsis:       Timezone names bugs in parsedate(3) manual page
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 06 23:10:00 +0000 2021
>Originator:     rudolf
>Release:        current
>Organization:
>Environment:
NetBSD 9.99.76 (GENERIC) #0: Mon Nov 30 22:26:30 UTC 2020  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
There seem to be some bugs in the ``Timezone names'' list in parsedate(3) manual page:

- listed twice with different offsets: acst (+0930), acst (+1030)
- incorrect offset: ist (+0550)
- zp4 (+0400), zp5 (+0500), zp6 (+0600) can't be used in ``date -d ...'' (error: Unrecognized date format) - this may have changed since my system was actually current

>How-To-Repeat:
see the output of:

for tz in acst ist zp4 zp5 zp6; do
date -d "2021-01-01 00:00:00 $tz"
done



>Fix: