Pick a start and end date to see the total number of days, the same span in weeks, months and years, and how many of those days are weekdays. Tick "include end date" when you want both the first and last day counted, which is common for leave, stays and deadlines.
The second calculator adds or subtracts days, weeks, months or years from any date and shows the resulting day of the week. It is handy for due dates, notice periods and "what is the date in 90 days" questions. Weekdays are Monday to Friday and do not account for public holidays.
Subtract the earlier date from the later one. This calculator does it for you and can include the end date if you want both days counted.
It counts weekdays, Monday to Friday. Public holidays vary by location, so subtract those yourself.
The date moves forward by calendar months. If the day does not exist in the target month (for example 31 January plus one month), it lands on the last day of that month.