EXCEL Column Formatting issue

when I enter an account 5140-11-30 and create a .CSV file it shows up as a date 11/30/5140 why? This is driving me crasy. When I look at a particular record it shows a single quote in format of the 5140-11-30. I tried to format the entire column to TEXT but same results happen I get a date format displaying 11/30/5140 can some one help me.

Thanks