tzDiff.ps1

tzDiff.ps1

param
(
    [Parameter(Mandatory = $true)]
    [String[]]
    $Timezone,

    [Parameter()]
    [Datetime]
    $Target
)

if (!$Target)
{
    # Get the local time as the target
    $Target = Get-Date
}

$tzObject = [System.Collections.Arraylist]::new()
$tzObject.Add(
    [PSCustomObject]@{
        'Timezone' = 'Local'
        'Time' = $Target
        'DifferenceInHours' = 0
    }
) | Out-Null

foreach ($tz in $Timezone)
{
    # Get the timezone difference
    $localTz = [System.TimeZoneInfo]::Local
    $remoteTz = [System.TimeZoneInfo]::FindSystemTimeZoneById($tz)
    $tzDifference = [float]($remoteTz.BaseUtcOffset.TotalHours - $localTz.BaseUtcOffset.TotalHours)
    $remoteTime = [System.TimeZoneInfo]::ConvertTime($Target, $localTz, $remoteTz)
    $tzObject.Add(
        [PSCustomObject]@{
            'Timezone' = $tz
            'Time' = $remoteTime
            'DifferenceInHours' = $tzDifference
        }
    ) | Out-Null
}

return $tzObject