title: How to get last day of a month from a given date?
body: <p>For example, the given date is <strong><em>04/04/1924</em></strong> and I want to find out the last day of February of the year 1924.</p>
  
  <p>I came up with the add_month but it seems not flexible if I have different given month from data source</p>
  
  <p>Any good ideas ?</p>