title: How do I handle date and time in different time zone?
body: <p>I'm developing an international software that act as a simple project management software and I'm facing a problem. This problem is about date/hour and time zone.<br>
  When a message is sent from one time zone to another time zone I can store the UTC (GMT) time in my database and then have it displayed differently according to the user's time zone. But this can't be done when I only work with date.<br>
  If I say a task is due to the 21st of March. Should I consider that this date can be 20 or 22 in some other countries ? What are your advices on this problem ?</p>