I would point out that "2013:05:19 13:45:45" is going to result in a different time stamp depending on which time zone it happens in. If you see that on your clock in New Zealand, it's a very different time stamp than one would get in London, for instance. The PHP [man]DateTime[/man] and [man]DateTimeZone[/man] classes will be very useful if you want to get precise about it.