title: How to return the last day of each month
body: <p>I am creating a view where i have multiple records showing up for each month. 
  Example: January is showing 20 records and February is showing 30 records. I only want the last record of EACH MONTH to show up. So i want to see 1 record for each month.</p>
  
  <p>I have already tried the first() and last() table calculation, but it does not filter by month, but by column. </p>