Work out the days, weeks and months between two dates, or add and subtract time from a date.
The difference tab reports the gap between two dates in years and months, in total days, in weeks, and in business days excluding weekends.
The add and subtract tab shifts a date by a number of days, weeks, months or years, which is what you want for deadlines and renewal dates.
Are business days aware of public holidays? No. Business days exclude Saturdays and Sundays only, because holidays vary by country and region.