If you would like to improve your Excel workflows and spreadsheets and in the process save a huge amount of time you might be interested in mastering Excel date functions. Once mastered this knowledge ...
It replaced my date-filling workflow, and I'm not going back.
Subtraction is the easiest way to count days between two dates in Excel. You can use the arithmetic operator – (minus sign) to subtract one date from another to find the number of days between them.