How To Make Clock To Show Time In Words

I want to make a Word Clock. Instead of showing the time as "12:30" I want it to show the words "It is half past twelve"

To Do this I've created a Square of Letters on an excel sheet (one letter per cell!) with black letters and black back grounds, when it is 12.30 I want the relevant letters to (cells) to change the text coulor to white so it shows up.

The cell I'm using are from D8 to P19 and the time is shown in A1

So lets say at 12.30 Cells D9, F12, H14 and M16 need to change from Black Text Colour to White Coulour,

I need a code or some VB that says "If A1 = 12.30 the Cells D9,F12,H14,M16 = White Text Colour, if not Black Text Colour".