Add rolling 6 month to current data expression

[Jennifer Tomasino]

Hi all,

I have the current expression running for a table to select a Crewmember from the Dropdown list:

case

WHEN [Crewmember]="${Crewmember}" then TRUE

else FALSE

END

 

I also need to add on an expression that only shows a rolling 6 month time frame. How would I add that expression into my current one

 

thanks,

Jen