title: C# convert UTC int to DateTime object
body: <p>I don't know why this is so complicated!</p>
  
  <p>I have a plugin that is passing in a long int UTC.  I need to convert that number into a <code>DateTime</code> to query my database (SQL Server).</p>
  
  <p>I don't know why, but I can't find a workable answer from a basic google search.</p>
  
  <p>(For extra credit, I need to turn my returned <code>DateTime</code> back into a UTC at the end of the day.)</p>
  
  <p>This is embarrassing to have to ask such a basic question! :)</p>