PowerShell让系统可以执行.ps1文件，开机，关机，在线时间 ， Function自定义函数

 Function Get-ComputerUptimeHistory { 
 $q=' 
<QueryList> 
 <Query Id="0" Path="System"> 
  <Select Path="System">*[System[(EventID=12 or EventID=13)]]</Select> 
 </Query> 
</QueryList>'
$events = Get-WinEvent -FilterXml $q
$i=-1 
while ( $i+1 -lt $events.length ) { 
 if($i -eq -1) 
 { 
 [PSCustomObject]@{ 
 StartTime = $events[0].TimeCreated; 
 StopTime = $null ; 
 UpTime = [datetime]::Now - $events[0].TimeCreated 
 } 
 } 
 else{ 
 [PSCustomObject]@{ 
 StartTime = $events[$i+1].TimeCreated; 
 StopTime = $events[$i].TimeCreated ; 
 UpTime = $events[$i].TimeCreated - $events[$i+1].TimeCreated 
 } 
 } 
 $i += 2 
} 
 
}

 Get-ComputerUptimeHistory | ft -AutoSize    >c:aaa.txt

结果运行结果　　

Name      Value              
----      -----              
UpTime    12:14:49.7832892   
StopTime                     
StartTime 2018-01-19 07:53:39
UpTime    03:06:09.3130450   
StopTime  2018-01-18 18:08:17
StartTime 2018-01-18 15:02:08
UpTime    13:48:06.0500843