>Either TODAY() or NOW() will work, provided that they are in the right order, that is the second date should always be greater or equal than the first one, weird...
>
>

>=DATEDIF("2019/01/15", "2018/03/17", "d") => #NUM
>=DATEDIF("2018/01/15", "2018/03/17", "d") => 61
>=DATEDIF(TODAY(), "2018/03/17", "d") => 65
>=DATEDIF(TODAY(), "2017/03/17", "d") => #NUM
>=DATEDIF("2017/03/17", TODAY(), "d") => 300
>

Thanks, this works.

I had to remove the equal sign.