לימות השנה בלבד

Since I mentioned לימות השנה בלבד I should add:

Every time I see those badatz hechsherim which say that, I think of Ben Zoma in the Hagadda: ימי חייך", הימים; "כול ימי חייך", הלילות" (courtesy of Mechon Mamre).

I mean, Pesach's during the year, isn't it?, so do they mean their hechsher doesn't cover night-time??? ;-)