Reading log file and calculating time between

Question

If someone could help me with this one, I would be very grateful.
I have a log file and I need to search a string that contains a start time and end time (eg. <time="11:10:58.000+000">). When I have these two values, I need to measure the time that has been elapsed between these two (from start to end).

Answer 1

$Path="C:\Times.log"
remove-item $Path
Add-Content $Path '<time="11:10:58.000+000">'
Add-Content $Path '<time="12:10:58.000+000">'
Add-Content $Path '<time="13:10:58.000+000">'
Add-Content $Path '<time="15:13:38.000+000">'
Add-Content $Path '<time="16:10:58.000+000">'
Add-Content $Path '<time="17:08:28.000+000">'
$File=Get-Content $Path
$StartTime=$Null
$EndTime=$Null
$ElapsedTime = $Null
ForEach ($Line in $File)
If ($Line.Contains("time="))
$Position = $Line.IndexOf("time=")
$TimeStr =$Line.SubString($Position+6,8)
IF ($StartTime -EQ $Null)
$StartTime = $TimeStr -As [System.TimeSpan]
Else
$EndTime = $TimeStr -As [System.TimeSpan]
$ElapsedTime = $EndTime.Subtract($StartTime)
"StartTime=$StartTime EndTime=$EndTime ElapsedTime=$ElapsedTime"
$StartTime = $Null
Gives this output
StartTime=11:10:58 EndTime=12:10:58 ElapsedTime=01:00:00
StartTime=13:10:58 EndTime=15:13:38 ElapsedTime=02:02:40
StartTime=16:10:58 EndTime=17:08:28 ElapsedTime=00:57:30