From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>
Subject: Re: git pull on ia64 linux tree
Date: Sun, 24 Apr 2005 06:02:46 +0100
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References: <Pine.LNX.4.58.0504221521260.2344@ppc970.osdl.org>
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To: Linus Torvalds <torvalds@osdl.org>
In-Reply-To: Your message of "Fri, 22 Apr 2005 15:34:32 PDT."
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> I think it would be nice to use the TZ data to show the thing in the
> timezone of the committer, though. Dunno how to do that, maybe
> something like
>	TZ=$tz date -d "1970-01-01 + $sec sec"
> Sadly, it looks like "date" doesn't understand timezone syntax like
> that

Try:

negzone=`echo $tz | tr '[-]+' '+-'`
date -u -R -d "1970-01-01 $negzone + $sec sec" | sed "s/+0000/$tz/"

Or as a script:

#!/bin/bash
# usage: show-date.sh <utcseconds> <zone>
negzone=`echo $2 | tr '[-]+' '+-'`
date -u -R -d "1970-01-01 $negzone + $1 sec" | sed "s/+0000/$2/"

A simple test:

$ show-date.sh 10 +0200
Thu, 01 Jan 1970 02:00:10 +0200

Negating the timezone is an ugly workaround for date not understanding
a sensible TZ format.  I almost always use -u with date, otherwise I
get confused about what timezone it is using to interpret and to print
the date.

-Sanjoy