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bug#9283: date increment failure for 2011-10-30

From: Eric Blake
Subject: bug#9283: date increment failure for 2011-10-30
Date: Thu, 11 Aug 2011 10:48:38 -0600
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tag 9283 notabug

On 08/11/2011 04:52 AM, address@hidden wrote:
Here's what I found adding +1 days to a 2011-10-30
(BTW this is not a problem for any other date I tried)

Thanks for the report. However, this is not a bug, but a consequence of daylight savings in your current choice of timezone. This is a FAQ:


fut=$(date -d"2011-10-30" '+%F') ;
echo $fut

fut=$(date -d"$fut +1 days" '+%F') ;
echo $fut

Adding 24 hours to midnight on a day with 25 hours still results in the same day, explaining your results. The FAQ details several options for avoiding the issue, such as fixing your calculations to UTC (which does not have daylight savings) or basing your computations relative to noon instead of midnight (since both a computed 11am and 1pm still fall in the right day, if your relative computation was affected by a daylight savings adjustment).

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Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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