This AppleScript when combined with Growl and DragonDictate for Mac will display the current date and time

growl-time.applescript

set the date_stamp to ((the current date) as string)
tell application "Growl"
	-- Make a list of all the notification types 
	set the allNotificationsList to ¬
		{"Date and Time"}
	--Default enable notifications
	set the enabledNotificationsList to ¬
		{"Date and Time"}
	--register with growl
	register as application ¬
		"Growl Date and Time" all notifications allNotificationsList ¬
		default notifications enabledNotificationsList ¬
		icon of application "AppleScript Editor"
	set body_text to "Date and Time: "
	--       Send a Notification...
	notify with name ¬
		"Date and Time" title ¬
		body_text description ¬
		date_stamp application name "Growl Date and Time"
end tell