[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#23008: Daylight Savings Time Bug in Date
From: |
Eric Blake |
Subject: |
bug#23008: Daylight Savings Time Bug in Date |
Date: |
Mon, 14 Mar 2016 09:04:16 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 |
tag 23008 notabug
thanks
On 03/13/2016 11:24 PM, Sarah Corriher wrote:
> We detected a bug in the date program, which correlates to the daylight
> savings time change.
Thanks for the report. However, this is not a bug, but a FAQ that gets
asked twice a year. See:
https://www.gnu.org/software/coreutils/faq/coreutils-faq.html#The-date-command-is-not-working-right_002e
>
> $ date -d -0days +%Y-%m-%d
> 2016-03-14
>
> $ date -d -1days +%Y-%m-%d
> 2016-03-12
When trying to add units of 24 hours (the -1days), only to then display
just a day and not an hour, it's best to start from noon rather than
from a time that might be impacted by daylight savings:
# date -d '12:00pm 2014-03-14 -1day' +%Y-%m-%d
2016-03-13
Otherwise, as you discovered, starting at midnight and going 24 hours
across a day with only 23 hours is likely to skip that day.
I'm closing this as not a bug, but feel free to reply with further
questions or comments.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
signature.asc
Description: OpenPGP digital signature