Got this: http://ompldr.org/vZzZtNA
I'd test it myself but I sold my Galaxy Nexus on Craigslist, waiting for the Nexus 4 to be released.
To deal with days the alarms have a 'repeat' option, listing which days the alarm should go off. Google Now can't handle these kinds of alarms yet. If you needed an alarm for a specific day then you'd probably use calendar alarms, however I don't think they're fully linked into Google Now at the moment.