$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"
}