title: Append string if not already present
body: <p>I have strings of time (how poetic) from a third party and some have the timezone while others don't. What I'd like to do append a timezone if one isn't present.</p>
  
  <p>Here are examples of strings with timezones...</p>
  
  <pre><code>5:21 AM MT
  10:01 PM MT
  8:41 PM MT
  </code></pre>
  
  <p>But sometimes that <code>MT</code> is missing for whatever reason.</p>
  
  <p>So, what I need to do is append <code>MT</code> after <code>AM</code> or <code>PM</code> if it's missing.</p>
  
  <p><em>(Note, I can't just check for <code>MT</code>. It could be any timezone. The primary goal here is to be able to append any timezone I choose after <code>AM</code> or <code>PM</code>).</em></p>