No it is not possible! (Now that I have said that someone will probably come
in with a method)

Youi could, however, make two triangles with different fills, and put text
in them or make the fills partially tranparent and put text in the cells
under them

"Helen T" wrote:

I am putting together a calendar on excel and would like to split a cell
diagnolly, colour each section and be able to type text in each triangle.
Is this possible and if so how ?

Many thanks
Helen