[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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).
https://www.gnu.org/software/coreutils/faq/coreutils-faq.html#The-date-command-is-not-working-right_002e
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
signature.asc
Description: OpenPGP digital signature