Convert Epoch to DateTime with PowerShell

ConvertEpoch-ToDateTime.ps1

function ConvertEpoch-ToDateTime
{
<#
.Synopsis
   Converts an epoch to a DateTime
.DESCRIPTION
   Needed this for validating JWT tokens using PowerShell.  Times were specified as NumericDate per RFC7519 (https://tools.ietf.org/html/rfc7519#section-4.1.4)
.EXAMPLE
   ConvertEpoch-ToDateTime -NumericDate 1565298477
.EXAMPLE
   #Convert an Epoch to the local time
   (ConvertEpoch-ToDateTime -NumericDate 1565298477).ToLocalTime()
#>
    [CmdletBinding()]
    [Alias()]
    [OutputType([int])]
    Param
    (
        # Param1 help description
        [Parameter(Mandatory=$true, Position=0)]
        [double]$NumericDate
    )

    ([DateTime]('1970,1,1')).AddSeconds($NumericDate)
}