Powershell to Event - powershell

Question

I've tried to make a PowerShell script that writes an event when the text files in an folder are older than 15 minutes.
This is the code I'm trying to use:
$targetfile=get-childitem C:\Users\user\Desktop\bizin\*.txt
if ($targetfile.AddMinutes -15 )
{
write-eventlog -logname Application -source ESENT -eventID 9999 -entrytype Error -message "No new files in 15min gate is down!" -category 3
'create event log to say bad things have happened'
}
I always get the event when I run the script. I would like to only get an event when the file is older than 15 minutes. It's going to be a scheduled task to run every 15 minutes.

Answer 1

You need to access the LastWriteTime property of the file and compare it with a DateTime object:
$targetFiles = Get-ChildItem -Path 'C:\Users\user\Desktop\bizin\' -Filter *.txt
foreach ($targetFile in $targetFiles)
{
if ($targetFile.LastWriteTime -lt [DateTime]::Now.AddMinutes(-15))
{
# Write the eventlog....
}
}
Note: You can use the -Filter parameter for the Get-ChildItem cmdlet to retrieve only txtfiles.
Here is the same example with use of aliases and the pipeline in just one line:
gci -Path 'C:\Users\user\Desktop\bizin\' -Filter *.txt | ? { $_.LastWriteTime -lt [DateTime]::Now.AddMinutes(-15) } | % { <# Write the eventlog... #> }