YTD with condition

[Anonymous]

I have to show YTD with condition like if  month selected is complete show YTD, if it is not complete(for ex: July 25,2014) show till June data.

like monthend(max(Calendermonthyear)=max(calendermonthyear), max(calendermonthyear)

     monthend(max(Calendermonthyear)>max(calendermonthyear),max(calendermonthyear)-1

right now Iam using this to find YTD

How do I modify expression to show above condition?