Here are the PowerShell commands to find the custom list created date and time.
$web = Get-SPWeb “http://mysites/sites”
$list = $web.lists["customlist"]
$listCreatedDate = $list.Created
$web.Dispose()
$list = $web.lists["customlist"]
$listCreatedDate = $list.Created
$web.Dispose()
Write-Host $listCreatedDate
Happy Share Pointing :-)

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