This collection of pictures from the Mid Ulster Mail archives shows that it was no different back in 2007 for these youngsters at Magherafelt and Castledawson primary schools who turned up for class in a wonderful variety of costumes to join in the fun.
Take a closer look and see if you see anyone you recognise.
1. World Book Day fun
Castledawson Primary School pupils who took to fancy dress to celebrate World Book Day in 2007. Photo: Simon Robinson
2. World Book Day fun
Pupils from Castledawson Primary School captured during the school's World Book Day celebrations in 2007. Photo: Simon Robinson
3. World Book Day fun
P6 and P7 pupils from Magherafelt Primary School who dressed up as their favourite book characters to mark World Book Day in 2007. Photo: Simon Robinson
4. World Book Day fun
Magherafelt Primary School P5 pupils on World Book Day in 2007. Photo: Simon Robinson