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