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Re: Date Computations cot executing properly!!

From: Eric Blake
Subject: Re: Date Computations cot executing properly!!
Date: Wed, 30 Oct 2013 12:35:34 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0

On 10/30/2013 12:27 PM, urvashi singla wrote:
> Hi,
> If i execute following computation -
> Next=$(date +%Y%m%d --date="$User 1 day)

> It gives correct result for all except for 20130927. For 20130927 it gives
> 20130927 instead of next date i.e. 20130928 I don't understand why is this
> so? Is this a bug?

No, this is a manifestation of daylight savings.  20130927 happens to
have 25 hours in your timezone, but '1 day' only increments by 24 hours.
 This is a FAQ; to get the behavior you desire, anchor your time to noon
rather than the default of midnight (so that even with the fuzz of
daylight savings causing 23- or 25-hour days, you still land in the
desired destination day).

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library

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