Change-Time.ps1

Function Change-Time {
    <#
    .SYNOPSIS
    To convert a larger time measure to a smaller measure ie how many milliseconds in an hour

    .DESCRIPTION
    Function takes a duration(a) and a measure(b) and returns an amount in a preferred measure(c)

    eg 4(a) hours(b) milliseconds(c)

    .EXAMPLE
    Change-Time -duration 4 -interval hours -output milliseconds 

    To get the number of milliseconds in 4 hours

    .EXAMPLE
    Change-Time -duration 1440 -interval minutes -output milliseconds

    To get the number of milliseconds in 1440 minutes

    #>
    [CmdletBinding()]
    
    param(
        # duration is the amount of time to be translated
        [parameter(mandatory=$true)]
        [int]$duration = 1,
        
        # Interval is the input time measure
        [parameter(mandatory=$true)]
        [validateset('milliseconds','seconds','minutes','hours')]
        [string]$interval = "hours",

        # Output is the output time measure
        [validateset('milliseconds','seconds','minutes','hours')]
        $output = "milliseconds"
    )

    begin {$msg = $null}

    process {

        switch ($interval) {
            "milliseconds" {$ts = New-TimeSpan -Seconds $duration/1000}
            "seconds" {$ts = New-TimeSpan -Seconds $duration}
            "minutes" {$ts = New-TimeSpan -Minutes $duration}
            "hours" {$ts = New-TimeSpan -Hours $duration}
            "days" {$ts = New-TimeSpan -Days $duration}
        }


        switch ($output) {
                "milliseconds" {$msg =$ts.totalmilliseconds}
                "seconds" {$msg = $ts.totalseconds}
                "minutes" {$msg = $ts.totalminutes}
                "hours" {$msg = $ts.hours}
            }
        
        [string]$return = "$duration $interval equals $msg $output"
        return $return
    }
    end {}
}