Add Days to Date
Add or subtract days, weeks, months or years from any date and see the resulting weekday.
100% private — everything runs in your browser
How to Use
- 1
Pick a start date, or press Today for the current date.
- 2
Enter how much to add and choose days, weeks, months or years.
- 3
Copy the resulting ISO date or read the weekday.
Examples
30 days later
Input
2026-01-01 + 30 daysOutput
2026-01-31Month-end clamp
Input
2026-01-31 + 1 monthOutput
2026-02-28FAQ
What happens at the end of a month?
One month after 31 January is 28 February (29 in a leap year): the day is clamped to the last valid date.
Can I subtract instead?
Yes, enter a negative amount such as -14 to go two weeks back.
Is the time of day included?
No, only calendar dates are calculated, so the result is always a date.
Related Tools
Date Difference CalculatorCount the days, weeks, months and business days between two dates.Age CalculatorCalculate exact age in years, months, days and more — right in your browser.Countdown TimerSet a countdown to any date and time — see days, hours, minutes and seconds remaining.Time Zone ConverterConvert a date and time between any two IANA time zones, with daylight saving handled automatically.World ClockCompare the current time in cities around the world, with day offsets and a searchable zone list.Timezone Meeting PlannerCompare one meeting time across up to fifteen cities and spot working hours.