A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
If by "automatic date function" you mean Excel's tendency to translate entries that appear to be dates, into dates, it cannot be turned off.
If you want to enter a string that looks like a date; e.g: 1-5 , you must either format the cell as text prior to entering the value, or precede the entry with a single quote (e.g '1-5) which will not show up on the worksheet itself, but tells Excel to treat the entry as text.
joeu recently quoted the Serenity Prayer by Niebuhr, which is applicable here:
Grant me the serenity to accept the things I cannot change,
Courage to change the things I can,
And wisdom to know the difference.