[CentOS] Trouble using date function in centos

Thomas Johansson thomasj at isy.liu.se
Sun Oct 5 09:59:18 UTC 2008


Stephen Harris wrote:
> On Sat, Oct 04, 2008 at 09:48:28PM +0200, Thomas Johansson wrote:
>> Is there someone that can explain why I get incorrect results on centos 
>> 4.6 and 4.7 but not on centos 5.2??
> 
>> test000:/% date -d "2008-10-25 +1 days" "+%Y-%m-%d"
>> 2008-10-26
>> test000:/% date -d "2008-10-26 +1 days" "+%Y-%m-%d"
>> 2008-10-26
> 
> 
> My initial immediate guess would be daylight savings related; if in
> your timezone the clock goes back on the 26th then 2008-10-26 (which
> means 00:00) + 24 hours would only be 2008-10-26 23:00.
> 
That was my problem. Became confused when i got different behavior on 
centos 4 and centos 5. Problem solved! Thank you!

To avoid that kind of trouble i moved to perl for the date functionality 
in my script. That solution is also more portable across my different 
*nix platforms.


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