Date Add Calculator
Add days, weeks, months, or years to any date and get the resulting date — handles month-end clamping correctly.
Result
General calculation reads
Amazon affiliateAs an Amazon Associate we may earn from qualifying purchases. This does not add cost for you.
How to use this calculator
- Pick the base date.
- Enter how many days, weeks, months, or years to add. Use a negative number to go backwards.
- Read the resulting date plus the day of the week it lands on.
About this calculator
Adding to a date sounds simple but has gotchas — Jan 31 + 1 month is February 28 or 29, not "Feb 31". This calculator follows the standard "clamp the day-of-month" rule used by date libraries, and shows the resulting day of the week along with the absolute day count for sanity-checking.
Frequently asked
What happens when I add a month to Jan 31?+
Can I subtract by entering a negative amount?+
Why is "weeks" just days × 7?+
How are leap years handled when adding years?+
Does the calculator account for time zones?+
Related calculators
More tools you might like
Hand-picked tools that pair well with this one — same audience, same intent.
Subtract days, weeks, months, or years from a date — for things like "what date was 90 days ago?" or "5 years before today".
Days, hours, minutes, seconds remaining until a target date.
Compute years between two dates with a years/months/days breakdown — useful for tenure, anniversaries, and exact-age questions.
Count whole calendar months between two dates, with the leftover days reported separately.
Count the exact number of days between any two dates — all calendar days, weekdays only, or business days (skipping US federal holidays). Pick whether to include both endpoints or just the difference.
Add date AcroForm fields to a PDF — text fields styled with date format hints and tooltips guiding the user toward MM/DD/YYYY entry.