How adding days works
Adding days simply counts forward on the calendar, including weekends and holidays. Adding 1 day to Monday gives Tuesday; adding 7 days gives the next Monday. For counting only working days, use the working days calculator.
Popular calculations
| Need | Add |
|---|---|
| One-month notice period | 30 days (or 1 month) |
| Two-month or three-month notice | 60 or 90 days |
| Return or replacement window | 7, 10 or 30 days |
| Pregnancy due date (from first day of last period) | 280 days |
| Visa or permit validity | 90 or 180 days |
Adding months and years
Months are added on the calendar, not as 30 days. 15 March plus 1 month is 15 April. If the day does not exist in the target month (31 January plus 1 month), the result is the last day of that month. To count the days between two dates instead, use the date difference calculator.