Add Days to Date Calculator
Add a number of days to any date and get the resulting date and weekday, with month lengths and leap years handled.
Independently verified for accuracy
Calculator by Toolsloft ↗- Result date
- 2026-07-30
- Day of week
- Thursday
Add a number of days to a date and see the exact date you land on, along with its weekday. Use it for deadlines, delivery windows, return-by dates, or any count-forward from a known day. Month lengths and leap years are handled for you.
How this is calculated
The start date is read as a calendar day, then the number of days is added straight through, rolling across month and year boundaries. February gets 29 days only in leap years, so a count that crosses it lands on the correct date.
How to use
- Enter the start date in YYYY-MM-DD format.
- Enter the number of days to add.
- Read the resulting date and its weekday.
Examples
- Ten days later:
2026-07-20 + 10 days = 2026-07-30 - Across a month end:
2020-02-27 + 3 days = 2020-03-01 - Two weeks:
2026-01-01 + 14 days = 2026-01-15
FAQ
- What date is 10 days from now?
- Enter today in the start box and 10 in the days box. The tool shows the exact date and weekday 10 days ahead.
- Does it handle leap years?
- Yes. A count that crosses the end of February lands correctly because leap years add February 29.