digotModule.psm1

function Show-Calendar {
param(
    [DateTime] $start = [DateTime]::Today,
    [DateTime] $end = $start,
    $firstDayOfWeek,
    [int[]] $highlightDay,
    [string[]] $highlightDate = [DateTime]::Today.ToString()
    )

    #actual code for the function goes here see the end of the topic for the complete code sample
}

Export-ModuleMember -Function Show-Calendar