In my native language, we call it “chaudhanvi” (literal English: 14th day).
“You are the Sun or the Moon of 14th day (i.e. you’re bloomed like the Moon) or whatever you are. I swear by God you are beyond compare.”
But actually, the Moon appears fully on its 15th day. In my language some poets use ‘14th day of the Moon’ to praise their beloveds as their beloveds are as beautiful and young as no one is.