ConvertTo-DateTime.ps1

function ConvertTo-DateTime {
    <#
        .SYNOPSIS
            Converts a TimeZoneInfo object into a DateTime object for that time zone.
        .DESCRIPTION
            This function can be used to convert a specific time zone into a DateTime object
            for that time zone.
        .EXAMPLE
            Get-TimeZone | Where-Object {$_.DisplayName -like '*Sydney*'} | ConvertTo-DateTime
        .NOTES
            Author: Øyvind Kallstad
            Date: 03.05.2015
            Version: 1.0
    #>
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline)]
        [ValidateNotNullOrEmpty()]
        [TimeZoneInfo] $TimeZone
    )

    $dateTime = ([datetime]::Now)
    $dtOffset = $TimeZone.GetUtcOffset($dateTime)
    Write-Output (($dateTime.Add($dtOffset)).ToUniversalTime())
}

function Get-TimeZone {
    Write-Output ([System.TimeZoneInfo]::GetSystemTimeZones())
}