title: First and Last day of current month
body: <p>In SQL Server Reporting Services; How can I calculate the first and last day of the previous month?</p>
  
  <p>I know I can use the expression below to get the last day of the current month, but I'm stuck when trying to find the first and last of the previous month.</p>
  
  <pre><code>=DateSerial(Year(Now()), Month(Now()), "1").AddMonths(1).AddDays(-1)
  </code></pre>