Date Calculator
Add or subtract days, weeks, months or years from a date.
Date & Time
Add or subtract
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Calendar arithmetic
- Days and weeks are exact: Adding 30 days counts 30 calendar days, across month and year ends and leap days.
- Months and years follow the calendar: Adding a month keeps the day of the month. Where the month is shorter, its last day is used: January 31 plus one month is February 28, or 29 in a leap year, and the page says so.
- Every result with its weekday: The date is shown with its weekday and as an ISO date (2026-12-24) to copy.
Frequently asked questions
Why is January 31 plus one month not March 3?
A month is a calendar step, not 30 days. The result stays in February and takes its last day, as calendars and most spreadsheet functions do.
Can I type the question instead?
Yes. "90 days from today" or "6 weeks ago" in the search is answered at once, and opens here with the numbers filled in.