Use `=B1-A1` to get the number of days between two dates
Use `=DATEDIF(A1,B1,”d”)` to calculate days between two dates
Use `=TODAY()-A1` to calculate days from a date to today
Use `=B1-A1+1` to include both start and end dates
Use `=NETWORKDAYS(A1,B1)` to count weekdays only
Use `=NETWORKDAYS.INTL(A1,B1,1)` to count weekdays with a custom weekend pattern
Format the result cell as Number if Excel displays a date instead of a day count