In which month Koha version 3.12?

Koha is on a six month development cycle, so it will be released in May 2012.

Sorry, time travel is only permitted for RMs. Everyone else will have to wait until May 2013.

Regards,
Jared 

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Jared Camins-Esakov
Bibliographer, C & P Bibliography Services, LLC
(phone) +1 (917) 727-3445
(e-mail) jcamins@cpbibliography.com
(web) http://www.cpbibliography.com/