UOTD.ps1

<#
.SYNOPSIS
This script calculates the computer Uptime Of The Day.

.DESCRIPTION
This script shows how long the machine has been running today.
It should works when machine exits sleep mode the first time of the day (ID 6013).

.PARAMETER Verbose
Used to specify weither or not display the list of the boots and reboots/shutdowns.

.EXAMPLE
.\UOTD.ps1 -Verbose
#>

param
(
    [switch]$Verbose
)

$BootsArray = [System.Collections.ArrayList]@()
$RestartsShutdownsArray = [System.Collections.ArrayList]@()

Foreach($log in Get-EventLog -LogName system  -After ([datetime]::Today) | ? { 6013 -contains $_.EventID} | sort TimeGenerated)#6013#6005
{
    if(($log.TimeGenerated.Minute -ne 0) -and ($log.TimeGenerated.Second -ne 0))
    {
        $BootsArrayID = $BootsArray.Add($log.TimeGenerated)
    }
}

Foreach($logB in Get-EventLog -LogName system  -After ([datetime]::Today) | ? { 6006 -contains $_.EventID} | sort TimeGenerated)
{
    $RestartsShutdownsArrayID = $RestartsShutdownsArray.Add($logB.TimeGenerated)
}

if($Verbose)
{
    Write-Output "Boots : "
    $BootsArray
    Write-Output "`nReboots/Shutdowns :`n "
    $RestartsShutdownsArray
}

$TotalSessionTime = New-TimeSpan
For($i=0;$i -lt $BootsArray.Count;$i++)
{
    if($i -lt $RestartsShutdownsArray.Count)
    {
        $SessionTime = New-TimeSpan –Start $BootsArray[$i] –End $RestartsShutdownsArray[$i]
        $TotalSessionTime += $SessionTime
    }
    else
    {
        $SessionTime = NEW-TIMESPAN –Start $BootsArray[$i] –End $(Get-Date)
        $TotalSessionTime += $SessionTime
    }
}

Write-Output "`nToday the machine has been running for a total of : $($TotalSessionTime.Hours)h $($TotalSessionTime.Minutes)m $($TotalSessionTime.Seconds)s"