functions/Get-RebootTime.ps1
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<#
.Synopsis Retrieves latest reboot time .Description Retrieves latest reboot time(s) of a system by event log entries .Parameter Computer Name of the computer to analyze .Parameter Latest Count of boot times to retrieve .Inputs None .Outputs None .Example Get-RebootTime Retrieves latest reboot time of the local system .Example Get-RebootTime REMOTECOMPUTER 3 Retrieves 3 latest reboot times of the system REMOTECOMPUTER .NOTES Name: Get-RebootTime Author: Markus Scholtes Version: 1.0 Date: 2016-06-06 #> function Get-RebootTime([STRING][Parameter(ValueFromPipeline=$TRUE)]$Computer = "$ENV:COMPUTERNAME", [INT32][ValidateScript({$_ -gt 0})]$Latest = 1) { # search latest reboot events in the system log try { $EVENTS = Get-EventLog -LogName System -ComputerName $Computer -Source Microsoft-Windows-Kernel-General -InstanceId 12 -Newest $Latest $SCRIPT:TIMESPAN = $NULL # loop through found events foreach ($EVENT in $EVENTS) { # get time stamp $BOOTTIME = $EVENT.TimeGenerated if (!$SCRIPT:TIMESPAN) { "Last boot time of computer $Computer`: $BOOTTIME" $SCRIPT:TIMESPAN = New-TimeSpan -Start $BOOTTIME if ($($SCRIPT:TIMESPAN.Days) -lt 1) { "Computer $Computer is active for less than a day." } else { "Computer $Computer is active for over $($SCRIPT:TIMESPAN.Days) days." } } else { "Boot time of computer $Computer`: $BOOTTIME" } } } catch { Write-Error "Cannot connect to computer $Computer" } } |