I want to take the change of time from excel rows and add it to a user prompted input in MatLab

Lets say I have rows of time data in excel that are [1, 2, 3, 4, 5, 6, 7] seconds. I have a user input command asking the user to ask for a time of day (say 13:00 military time). I want to take the time difference in row 1 and row 2 from the excel file and add that difference to the user inputed time.

I have all of the excel data inputted into MatLab already so I really just need an equation that would allow me to do this.