Date Being Updated On Consequent Opening Of File

I have created a spreadsheet and saved it as a template. when the staff open it to enter information they use save as and give it a name. They only need open and enter information once. I have put into this spreadsheet in cell A1 a formula to enter the days date. This all works fine. A few days later I need to access the spreadsheet to check the figures entered and obviously the date changes to the date when I open it up. Is there any way of stopping this happening without using macros. i.e. keep the date as the day they entered the information.