I had to look it up how you spell twelfth. I knew it was that or thelvth, but there's definitely an F sound in it. It's not a word I spell very often, so I haven't got it on the tip of my brain.
It's the twelfth of the month but not the twelfth of never.
I've got that song playing right now ... Johnny Mathis. How long will he love you? Until the twelfth of never, he'll still be loving you. And that's a long, long time.