Create sharepoint datetime control using powershell script

Visit my previous post for to create a list through powershell script
Create list using powershell script
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$lncustomListName listName
$docSite = new-object Microsoft.SharePoint.SPSite($siteURL)
$docWeb = $docSite.OpenWeb()

/* To create DateTime field for allow only one user/group */
Add-SPDateTimeField -listName $lncustomListName -Name DateTimeFieldName  -DisplayName DateTimeFieldName  -DateType DateOnly -Required FALSE

/* Method to create people DateTime field */
function Add-SPDateTimeField([string]$listName, [string]$DisplayName, [string]$Name, [string]$Required, [string]$DateType)
{
   $OpenList = $docWeb.Lists[$listName]
   $fldXml = "<Field Type='DateTime' DisplayName='"+ $DisplayName +"' Format='"+ $DateType +"' Required='"+ $Required +"' Name='"+ $Name +"'/>"
   $OpenList.Fields.AddFieldAsXml($fldXml,$true,
   [Microsoft.SharePoint.SPAddFieldOptions]::AddFieldToDefaultView)
}
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Please let me know if faced any issues.