I have a spread sheet that I am creating to collect equipment downtime, The problem that I'm having is as follows; I have two columns, start time and end time, in which the operator logs the time that the problem started and finished and another column that adds the difference in time and converts it to minutes. I need the addition column to look at the start/end columns for time frames equivalent or between to the one that it will add and if it finds it, put zero. I'm pulling the last few hairs left in my head with this one.