Below is an overview of shipping and delivery around public holidays / days off in the Netherlands.

PostNL

Holiday	Country	Order date (before 4:30 PM)	1st delivery date	2nd delivery date
Kingsday		do 25 apr	vr 26 apr	ma 29 apr
		vr 26 apr	ma 29 apr	di 30 apr
		za 27 apr	di 30 apr	wo 1 mei
		zo 28 apr	di 30 apr	wo 1 mei
		ma 29 apr	di 30 apr	wo 1 mei

GLS

Holiday	Country	Order date (before 4:30 PM)	1st delivery date	2nd delivery date
Kingsday		do 25 apr	vr 26 apr	ma 29 apr
		vr 26 apr	ma 29 apr	di 30 apr
		za 27 apr	di 30 apr	wo 1 mei
		zo 28 apr	di 30 apr	wo 1 mei
		di 23 apr	wo 24 apr	do 25 apr