Thanks for the data sheet tip, i have never thought about looking there. 
Sorry for not saying which library i am using, should have thought about that, i am using the <DS3231.h> library is there the same fetcher for this?? and where could i read up myself to find that out (sorry probably a very stupid question)? If it does not have can i just include Jack Christensens DS3232.h one and then just use the rtc.get() to get the time or is it bad practice to have two libraries for the same hardware?