Add Apostrophe symbol in Excel through Ax

I need to read values from excel file in Ax. i have 2 cells in the excel file that contains time value. i need to add an apostrophe symbol before the time value in the excel cell. How do i do this through AX??? i need to read the values on a daily basis, So the apostrophe has to be added in the excel on a daily basis. kindly suggest me on how to develop the same.