It means that the defendant was sentenced to serve six months of custody time for his/her case. It looks like a total of 12 days was credited for time spent in jail prior to the imposition of sentence.
The defendant can opt to serve his/her time by working through the weekend work release program, which is administered through the Glen Helen Jail facility. Alternately, the defendant can arrange to serve the time by surrendering to jail, should he/she choose.
I'm not sure what exactly you're asking here, to tell the truth. I hope this helped.
Any statements I make in these forums (fora?) should not be taken as direct legal advice, merely informed guidance. This is true due to the anonymous nature of this venue, and the incomplete information which is invariably provided by the questions. It is imperative that you consult directly with an attorney regarding your specific situation before acting on or relying on anything represented here. Period.