Function Write-LogEntry
{
    #Write data to a CMTrace compatible log file. (Credit to SCConfigMgr - https://www.scconfigmgr.com/)

	param(
		[parameter(Mandatory = $true, HelpMessage = "Value added to the log file.")]
		[ValidateNotNullOrEmpty()]
		[string]$Value,
		[parameter(Mandatory = $true, HelpMessage = "Severity for the log entry. 1 for Informational, 2 for Warning and 3 for Error.")]
		[ValidateNotNullOrEmpty()]
		[ValidateSet("1", "2", "3")]
		[string]$Severity,
		[parameter(Mandatory = $true, HelpMessage = "Component of the log file.")]
		[ValidateNotNullOrEmpty()]
		[string]$Component,
		[parameter(Mandatory = $false, HelpMessage = "Name of the log file that the entry will written to.")]
		[ValidateNotNullOrEmpty()]
		[string]$FileName
	)
    #Determine log file location
    $LogFilePath = $FileName
    #Construct time stamp for log entry
    if(-not(Test-Path -Path 'variable:global:TimezoneBias'))
    {
        [string]$global:TimezoneBias = [System.TimeZoneInfo]::Local.GetUtcOffset((Get-Date)).TotalMinutes
        if($TimezoneBias -match "^-")
        {
            $TimezoneBias = $TimezoneBias.Replace('-', '+')
        }
        else
        {
            $TimezoneBias = '-' + $TimezoneBias
        }
    }
    $Time = -join @((Get-Date -Format "HH:mm:ss.fff"), $TimezoneBias)
    #Construct date for log entry
    $Date = (Get-Date -Format "MM-dd-yyyy")
    #Construct context for log entry
    $Context = $([System.Security.Principal.WindowsIdentity]::GetCurrent().Name)
    #Construct final log entry
    $LogText = "<![LOG[$($Value)]LOG]!><time=""$($Time)"" date=""$($Date)"" component=""$($Component)"" context=""$($Context)"" type=""$($Severity)"" thread=""$($PID)"" file="""">"
    #Add value to log file
    try
    {
        Out-File -InputObject $LogText -Append -NoClobber -Encoding Default -FilePath $LogFilePath -ErrorAction Stop
    }
    catch [System.Exception]
    {
        Write-Warning -Message "Unable to append log entry to $FileName file. Error message at line $($_.InvocationInfo.ScriptLineNumber): $($_.Exception.Message)"
    }
}