Device_Uptime.ps1

Function Get_DeviceUpTime
	{
		param(
		[Switch]$Show_Days,
		[Switch]$Show_Uptime			
		)		
		
		$Last_reboot = Get-ciminstance Win32_OperatingSystem | Select -Exp LastBootUpTime
		$Check_FastBoot = (Get-ItemProperty "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Power" -ea silentlycontinue).HiberbootEnabled 
		If(($Check_FastBoot -eq $null) -or ($Check_FastBoot -eq 0))
			{
				$Boot_Event = Get-WinEvent -ProviderName 'Microsoft-Windows-Kernel-Boot'| where {$_.ID -eq 27 -and $_.message -like "*0x0*"}
				If($Boot_Event -ne $null)
					{
						$Last_boot = $Boot_Event[0].TimeCreated
					}
			}
		ElseIf($Check_FastBoot -eq 1)
			{
				$Boot_Event = Get-WinEvent -ProviderName 'Microsoft-Windows-Kernel-Boot'| where {$_.ID -eq 27 -and $_.message -like "*0x1*"}
				If($Boot_Event -ne $null)
					{
						$Last_boot = $Boot_Event[0].TimeCreated
					}
			}		
			
		If($Last_boot -eq $null)
			{
				$Uptime = $Uptime = $Last_reboot
			}
		Else
			{
				If($Last_reboot -ge $Last_boot)
					{
						$Uptime = $Last_reboot
					}
				Else
					{
						$Uptime = $Last_boot
					}
			}
		
		If($Show_Days)
			{
				$Current_Date = get-date
				$Diff_boot_time = $Current_Date - $Uptime
				$Boot_Uptime_Days = $Diff_boot_time.Days	
				$Real_Uptime = $Boot_Uptime_Days
			}
		ElseIf($Show_Uptime)
			{
				$Real_Uptime = $Uptime
				
			}
		ElseIf(($Show_Days -eq $False) -and ($Show_Uptime -eq $False))
			{
				$Real_Uptime = $Uptime				
			}			
		Return "$Real_Uptime"
	}