How do I set the time axis on my waveform chart to show run time i.e each time i start the program i should have 0 as my starting point

How do I set the time axis on my waveform chart to show run time i.e each time i start the program i should have 0 as my starting point. I've been messing around with the without success. I'm running Labview 2012.

Thank you!