Excel weird behaviour with dates => text

Question

I have a ton of cells that contain dates such as 22/12/2013. This is set automatically as Date format. And if I try to change the cell format to text (Simply because I want

Answer 1

As andy holaday says, using cell formatting to change the format won't actually change existing numbers (dates) to text. You can do that with "text to columns" functionality:

Select column of dates > Data > Text to columns > Next > Next > at step 3, under "column data format" choose "text" > Finish

That converts existing dates, if you have dates to enter which you want to enter as text you can add an apostrophe, as Polly says, or you can simply pre-format the entry column as text format.