Private/ConvertFrom-HiveTime.ps1

function ConvertFrom-HiveTime {
<#
.SYNOPSIS
    Provides basic date time conversion for Hive timestamps.
.DESCRIPTION
    Hive uses timestamps in milliseconds past the epoc.
    This helper function converts these times to date time UTC format.
.INPUTS
    Does not take pipeline input.
.OUTPUTS
    DateTime UTC.
#>

    [CmdletBinding()] param (
    [Parameter(Mandatory=$true, Position = 0)]
        [ValidateNotNullOrEmpty()]
        [uint64]$Miliseconds
    )
    $epoc = Get-Date -Date 01/01/1970
    $converted=$epoc.AddMilliseconds($Miliseconds)
    return $converted.GetDateTimeFormats('u')
}