title: Convert ActiveSupport::TimeWithZone to DateTime
body: <p>I'm trying to step every N days between two dates. I tried the following code but is wasn't working because startDate and endDate are ActiveSupport::TimeWithZone objects and not DateTime objects like I thought.</p>
  
  <pre><code>startDate.step(endDate, step=7) { |d| puts d.to_s}
    min.step(max, step=stepInt){ |d|
    puts d.to_s  
  }
  </code></pre>
  
  <p>How do I covert the TimeWithZone object to a DateTime?</p>