Timestamp difference

I was looking into Windows Application Log and SQL Server Error Log to investigate a incident, and needed to calculate the effective duration of the incident.

This is actually quite simple using PowerShell and the CmdLet Get-Date:
(Get-Date "24-06-2011 08:00:24") - (Get-Date "23-06-2011 16:24:49")

Days              : 0
Hours             : 15
Minutes           : 35
Seconds           : 35
Milliseconds      : 0
Ticks             : 561350000000
TotalDays         : 0,649710648148148
TotalHours        : 15,5930555555556
TotalMinutes      : 935,583333333333
TotalSeconds      : 56135
TotalMilliseconds : 56135000

A more compact answer can be acquired by
((Get-Date "24-06-2011 08:00:24") - (Get-Date "23-06-2011 16:24:49")).ToString()
15:35:35

The statement converts the timestamp strings to DateTime (System.DateTime) objects, subtracts the two objects and returns a TimeSpan (System.TimeSpan) object.