From owner-freebsd-bugs  Mon Apr  5  9:32: 0 1999
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Date: Mon, 5 Apr 1999 18:23:24 +0200 (CEST)
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Subject: bin/10963: date -v gets confused when dailight saving time is active
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>Number:         10963
>Category:       bin
>Synopsis:       date -v dosen't quite work
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Apr  5 09:30:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Patrick M. Hausen
>Release:        FreeBSD 2.2.7-RELEASE through 3.1-RELEASE (tested)
>Organization:
WEB Internet Services Systemhaus GmbH
>Environment:

	/etc/localtime set for Germany, switching to dailight saving
	on the last Sunday of March

>Description:

	I do some date manipulation in /bin/sh scripts for our
	IP accounting system. One particular script is run right
	after midnight to sum up the traffic values for certain
	router ports. On the first of April I got completely bogus
	values. Looks like /bin/date has got April Fool's Day functionality
	;-)

	The script gets the start and end date for it's calculations
	like this:

	today=`date +%Y-%m-%d`
	yesterday=`date -v-1d +%Y-%m-%d`
	day1=`date -v-1d -v1d +%Y-%m-%d`

	Then it sums up everything from $day1, i.e. the 1st of the
	current (in terms of "yesterday", since the script runs past
	midnight) month, up to $yesterday.

	This gave - as stated - bogus results on the 1st of April.

>How-To-Repeat:

	Set timezone for Germany

	ardbeg# date 9904010001
	Thu  1 Apr 00:01:00 CEST 1999

	ardbeg# date -v-1d
	Sun 28 Feb 23:02:29 CET 1999

	Now, that should clearly read "31 Mar", not "28 Feb".

>Fix:
	
	dunno

>Release-Note:
>Audit-Trail:
>Unformatted:


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