Powershell Select-String 如何按日期过滤？

Question

I have a log file that starts with date format, I want to filter out lines that were added in the past 5min and work on them, but when I run my code it gives me wrong data

Log file Syntax

01/12/2020 00:00:00 log info

Code

$referenceTime = '{0:dd/MM/yyyy HH:mm:ss}' -f (Get-Date).AddMinutes(-5)
Get-Content -Path 'C:\..\data.log' |
Where-Object { (($_ -split '\s')[0] + " " + ($_ -split '\s')[1]) -gt $referenceTime } |
ForEach-Object {
    #DO SOMETHING..
}

Answer 1

Dates should be compared to other dates, so you should not stringify them.

Try

$referenceTime = (Get-Date).AddMinutes(-5)
Get-Content -Path 'C:\..\data.log' |
Where-Object { $_ -match '^(\d{2}/\d{2}/\d{4} \d{2}:\d{2}:\d{2})' } |
Where-Object { [datetime]::ParseExact($matches[1], 'dd/MM/yyyy HH:mm:ss', $null) -gt $referenceTime } |
ForEach-Object {
    $_
    #DO SOMETHING.. For demo just output the line(s) that matched
}

The first Where-Object matches any line that starts with what looks like a date in the given format and captures that part of the line in $matches[1] .
The second Where-Object parses this matched date into a real [DateTime] object, so you can compare it with the date in $referenceTime