title: What's the most efficient way get the first day of the current month?
body: <p>With ruby I'm trying to get format a date as such: 2009-10-01</p>
  
  <p>Where I take the current date (2009-10-26) and then change the day to "01".</p>
  
  <p>I know of ways to do this, but was curious what the shortest way is, code wise, to pull this off.</p>