PowerShell function to add the appropriate ordinal number suffix to an integer for any number and return the number and suffix. Based on: http://stackoverflow.com/questions/19501722/how-to-convert-a-date-string-with-ordinal-suffix-to-another-format

Get-OrdinalNumber.ps1

Function Get-OrdinalNumber {
    Param(
        [Parameter(Mandatory=$true)]
        [int64]$num
    )

    $Suffix = Switch -regex ($Num) {
        '1(1|2|3)$' { 'th'; break }
        '.?1$'      { 'st'; break }
        '.?2$'      { 'nd'; break }
        '.?3$'      { 'rd'; break }
        default     { 'th'; break }
    }
    Write-Output "$Num$Suffix"
}

Hi, I found a bug, just FYI
`PS ..\H:\

Get-OrdinalNumber 911
911th
PS ..\H:
Get-OrdinalNumber 912
912th`

It works OK if you just remove this one line:
'1(1|2|3)$' { 'th'; break }

Edit: Also I am going to rename this function in my fork to "Add-OrdinalSuffix" FWIW

@tonypags I think that is a feature. "nine hundred eleventh", and "nine hundred twelfth", not "nine hundred tenty first", or "nine hundred tenty second"

How silly of 2018-me to suggest otherwise ;-)