Add Days to a Date
Find the date that is a number of days, weeks, months or business days after — or before — another date.
Dates use your device’s calendar. Business days are Monday to Friday.
How to add days to a date
Pick a start date, choose add or subtract, and enter a number of days, weeks, months, years or business days. The calculator shows the new date with its weekday, the day of the year and the week number.
Example: 90 days after 1 March 2027 is Sunday, 30 May 2027.
Days vs months
Adding 3 months is not the same as adding 90 days. Months follow the calendar: 3 months after 30 November is 28 February (or 29 in a leap year), because February has no 30th. Contracts and notice periods are usually given in months; returns, payment terms and visas often in days.
Business days
Choose business days to skip weekends — and public holidays, if you tick the option below the calculator. 10 business days after a Monday is the Monday two weeks later.
Frequently asked questions
What date is 90 days from today?
Leave today as the start date, enter 90 days and choose Add. The new date appears at once.
How do I subtract days from a date?
Choose Subtract and enter the number of days. Use it to find a start date from a deadline, for example 30 days before a trip.
How do I add business days to a date?
Choose business days as the unit. Weekends — and public holidays, if selected — are skipped.