Schedule an item in the SharePoint document library using powershell

$site=Get-SPSite "http://serverName:1111/"
$web=$site.RootWeb
$list=$web.Lists["Doc Library"]
$listItem=$list.GetItemById(2)
if([Microsoft.SharePoint.Publishing.ScheduledItem]::IsScheduledItem($listItem))
{
    $scheduledItem = [Microsoft.SharePoint.Publishing.ScheduledItem]::GetScheduledItem($listItem)
    $startDate = new-object DateTime(2011, 4, 6, 22, 50, 00)
    $endDate = new-object DateTime(2011, 4, 6, 22, 51, 00)
    $scheduledItem.StartDate = $startDate
    $scheduledItem.EndDate = $endDate
    $scheduledItem.ListItem.Update()
    $scheduledItem.Schedule()
    write-host -f green "SPListItem is successfully scheduled"
}
else
{
    write-host -f yellow "SPListItem does not support scheduling"
}