Adaptation to ISO 27001:2013

I read this information "Whilst certificates are dated for a three year period, ISO/IEC 27001:2005 will be obsolete from 1 October 2015 and therefore all certificates to the 2005 version of ISO/IEC 27001 expire on this date." from https://www.bsigroup.com/en-GB/iso-27001-i******************************************; which make me quite confuse about the exact expiry data.
 

Answer:

All companies with the old version of the standard (ISO 27001:2005) have a time for the adaptation to the new version (ISO 27001:2013), but I think that the dates for this adaptation depends of each company.  I think that you need to ask directly to your certification body.
Anyway, our recommendation is that you implement as soon as possible the new version. There is no important changes, so it is very easy the adaptation. For know difference between old and new version of the ISO 27001, you can read this arti cle “How to make a transition from ISO 27001 2005 revision to 2013 revision” : https://advisera.com/27001academy/knowledgebase/how-to-make-a-transition-from-iso-27001-2005-revision-to-2013-revision/