Append to end of text file

Hi all,

I have a program that writes input data into a text file. Every time I write to the text file, it shows the Time and Date. However, I only want the Time and Date in my text file to show only once and the input data to be appended continously to the end of the text file.

Can someone point me in the right direction as to how to do it?

P.S. I'm using LabVIEW 2012