title: How can I handle time zones in my webapp?
body: <p>I'm looking for better understanding of the following user story:</p>
  
  <p>John works in Sidney. At 9:00 in the morning, he logs an event in a web app that runs on a server in Zurich. The next day, he travels to New York for an emergency meeting in which the event should be discussed. During the meeting, he searches for the event by date and time.</p>
  
  <p>As I see it, there are at least two issues here:</p>
  
  <ol>
  <li>How should I save the time stamps in the database</li>
  <li>How should I present them in the UI</li>
  </ol>
  
  <p>When John searches the event, he will know that it happened at 9:00 but what should he enter in the web browser? He won't find anything when he just enters "9:00" as timestamp because that might be Zurich or New York time (since the event hasn't been found, the app has no way to know that it happened in Sidney, so it can't automatically select the correct time zone).</p>
  
  <p>What is a good way to ask the user for a timestamp that might include the time zone?</p>
  
  <p>The second issue is how to display the results. If teams from all over the globe need to discuss the event (and find related events, think of a cracker attack that targets several sites all over the globe at once).</p>
  
  <p>What is a good example for displaying timestamps that might have been created in a different time zone?</p>
  
  <p>Note: Please concentrate on the usability of the requirement. I can figure out the database mapping myself. Currently, I'm unsure about the work flow. It should ask/present the necessary information in an non-intrusive/intuitive way. If you can, give a link to an existing web app which already solves this.</p>