Guys I have this problem.

I need help in putting the time interval into chart

say in cell A1 I put date and time started "19/03/2018 5:00:00 PM""
in cell A2 I put date and time finished "20/03/2018 5:00:00 AM"
then I computed for the time interval in cell A3 "=text(A2-A1, "h") which will give me a value of 12


now here comes my problem. I can't seem to put the value "12" in a graph or chart because excel does not recognized it as a value. is there any way for me to make this readable by excel's graph or chart?