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Date: Mon, 26 Nov 2012 11:46:59 +0000
From: Peter Stephenson <p.stephenson@samsung.com>
To: "zsh-users@zsh.org" <zsh-users@zsh.org>
Subject: Re: Date prompt expansion
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On Mon, 26 Nov 2012 12:33:25 +0100
Mark van Dijk <lists+zsh@internecto.net> wrote:
> 2) for yesterday I'm using FreeBSD's date command:
> yesterdaysDay=$(/bin/date -v -1d "+%y")
> yesterdaysMonth=$(/bin/date -v -1d "+%m")

(You probably mean "+%d" rather "+%y" in the first one.)

Up to oddities with leap seconds, you can do it by

zmodload zsh/datetime
strftime -s yesterdaysDay "+%d" $(( EPOCHSECONDS - 24 * 60 * 60 ))

pws