<div class="container" id="pilot-page">
  <div class="row">
    <h2 class="stylish-title">Pilot</h2>
  </div>
  <div class="row">
    <% if Time.zone.now < Time.zone.parse('May 1, 2016') %>
      <iframe
       width="100%"
       height="520"
       frameborder="0"
       src="https://williamcodes.cartodb.com/viz/0fa4d186-e4a5-11e5-be27-0ef7f98ade21/embed_map"
       allowfullscreen
       webkitallowfullscreen
       mozallowfullscreen
       oallowfullscreen
       msallowfullscreen>
      </iframe>
    <% else %>
      <h4>Map is undergoing maintenance. Please check back later.</h4>
    <% end %>
  </div>
</div>

<div class="container" id="pilot-page">
  <div class="row">
    <h2 class="stylish-title">Pilot</h2>
  </div>
  <div class="row">
    <% if Time.zone.now < Time.zone.parse("May 1, 2016") %>
      <iframe
       width="100%"
       height="520"
       frameborder="0"
       src="https://williamcodes.cartodb.com/viz/0fa4d186-e4a5-11e5-be27-0ef7f98ade21/embed_map"
       allowfullscreen
       webkitallowfullscreen
       mozallowfullscreen
       oallowfullscreen
       msallowfullscreen>
      </iframe>
    <% else %>
      <h4>Map is undergoing maintenance. Please check back later.</h4>
    <% end %>
  </div>
</div>

Use double quotes instead of single quotes
Use double quotes instead of single quotes
