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Re: date command


From: Bob Proulx
Subject: Re: date command
Date: Tue, 4 Oct 2011 20:25:12 -0600
User-agent: Mutt/1.5.21 (2010-09-15)

s.ploss@juno.com wrote:
> Bash Version: 4.1
> 
>         When using date command with -d option, if the date is between
> "2010-03-14 02:00" and "2010-03-14 02:59" inclusive, it gives an
> "invalid date" error.  You can test this with the following command:
> echo $(date -d "2010-03-14 02:00" +%s)
> Dates outside this range work fine.

First, 'date' is a coreutils command, not a 'bash' command.  Bugs in
'date' should be reported to the bug-coreutils mailing list not the
bug-bash mailing list.

Second, what you are seeing is almost certainly due to daylight saving
time being in effect and skipping over that time interval.  In my
US/Mountain timezone those dates are invalid and do not exist.

  $ TZ=US/Mountain date -d '2010-03-14 02:59'
  date: invalid date `2010-03-14 02:59'

The above is correct behavior since by Act of Congress DST changed
then and skipped that hour.

  $ zdump -v US/Mountain | grep 2010
  US/Mountain  Sun Mar 14 08:59:59 2010 UTC = Sun Mar 14 01:59:59 2010 MST 
isdst=0 gmtoff=-25200
  US/Mountain  Sun Mar 14 09:00:00 2010 UTC = Sun Mar 14 03:00:00 2010 MDT 
isdst=1 gmtoff=-21600
  US/Mountain  Sun Nov  7 07:59:59 2010 UTC = Sun Nov  7 01:59:59 2010 MDT 
isdst=1 gmtoff=-21600
  US/Mountain  Sun Nov  7 08:00:00 2010 UTC = Sun Nov  7 01:00:00 2010 MST 
isdst=0 gmtoff=-25200

See this FAQ entry for more information:

  
http://www.gnu.org/software/coreutils/faq/#The-date-command-is-not-working-right_002e

Bob



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