Add Days to Date
Add or subtract days, weeks, months or years.
About this tool
Add Days to Date finds the date that falls a set number of days, weeks, months or years before or after a start date. Turn on business days to skip Saturdays and Sundays, which is how many contract and shipping deadlines are counted.
How to use Add Days to Date
- Pick a start date.
- Choose Add or Subtract and enter years, months, weeks or days.
- Read the result date and weekday.
Questions people ask
What happens when I add a month to 31 January?
The day is clamped to the last day of the target month, so 31 January plus 1 month is 28 February (29 in a leap year). This matches how most spreadsheets and banks handle month-end dates.
How do business days work here?
With the option on, only Monday to Friday count as days. Adding 1 business day to a Friday gives the next Monday. Years, months and weeks are applied first as calendar time, then the business days are counted.
What is 90 days from today?
Leave the start date as today, choose Add and type 90 in Days. The result shows the exact date and weekday. A 90-day count is common for visa stays, return windows and probation periods.