Date Calculator

Add or subtract days, weeks, months, and years from any date
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How Date Calculations Work

1

Year Changes

Adding years keeps the same month and day. Leap year Feb 29 becomes Feb 28 in non-leap years.

2

Month Changes

Months have different lengths (28-31 days). Our calculator handles overflow correctly.

3

Day Changes

Simple addition or subtraction of calendar days, accounting for month boundaries.

Common Uses

  • Project deadlines: What date is 90 days from today?
  • Retirement planning: What date is 30 years from my start date?
  • Event planning: What was the date 6 months ago?
  • Contract terms: Add 1 year and 3 months to a start date
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