Thank you Bob. I got it clear.

On 2014/5/27 10:55, Bob Proulx wrote:
> HoHo Zhao wrote:
>> Wrong:
>>      $ TZ=UTC date -d "15:00 CST"   (China Standard Time)
>>      Mon May 26 21:00:00 UTC 2014
>>
>> So the problem is with "CST" in the date STRING.
> 
> CST in the above is being interpreted as US Central Standard Time.
> For Central Standard Time it is correct.
> 
> CST is one of the ambiguous timezones that Pádraig referred to.  This
> is one of the reasons "date -R" with the unambiguous numeric timezones
> is the better output format.
> 
> Bob
> 
> 

-- 
HoHo Zhao
Regional IT Support
Red Hat Greater China



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