Percentages aren't always easy to calculate, but one of the best tools in Excel's toolbox is calculating percentages for you. Here's how to do it.

However, if you calculate the time difference in number format, it will work differently i.e, 12:00 PM will be calculated to 0.05 because it’s half of a day.

The article How to calculate conditional subtotals in an Excel revenue sheet uses simple expressions, a function, and a conditional format to display a daily balance in a revenue sheet.