Oops, it doesn't look like 'Tiff day' is a national day..

Other days

cursing

Cursing Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
boyfriend

Boyfriend Day
ruby

Ruby Day
one

One Day
book

Book Day
eat what you want

Eat What You Want Day
offer

Offer Day
cuddle up

Cuddle Up Day
gallery

Gallery Day