There is no easy way in splunk. Have to use Powershell addon with the following command for upload
Get-ChildItem '\*.log' -Recurse | Get-Content | %{if($_ -match '^@@'){$a=($_ -replace '^@@(\d{2})\/(\d{2})\/(\d{4})(\d{2})','$3-$2-$1T$4:');"$($a)00:00"}else{"$a$($ -replace '^(\d{2})(\d{2}.\d{3})', '$1:$2 ')"}}
... View more