More detailed timestamps

[Emill]

When viewing a queue, each person has a time how long that person has been in the queue, for example 5 hours. For the adk-course, this will not be enough since we want to know the exact timestamp the user entered the queue.

The common way to solve this is to show the exact time on mouse hover, like 2014-01-02 14:05:30. See for example how github does this.

[Emill]

I also notice that >= 45 minutes is denoted as an hour. You should probably not switch to hour precision until 60 minutes have actually past, since those who have waited 45 minutes have not waited an hour (in my opinion).