How to Use the Date Calculator

This date calculator offers two useful modes. In Days Between Dates mode, enter any two dates to find the exact difference in days, weeks, months, and years. It also shows business days (excluding weekends) which is useful for project planning. In Add/Subtract Days mode, start from any date and add or subtract a specific number of days to find the resulting date.

Common Uses

• Calculate how many days until a deadline, event, or vacation
• Find the number of business days between two dates for project planning
• Determine a due date by adding days to a start date
• Calculate the duration of a lease, contract, or subscription
• Figure out what date it will be in a certain number of days

About Leap Years

A leap year occurs every 4 years (with exceptions for years divisible by 100, unless also divisible by 400). Leap years add one extra day (February 29) to the calendar, which this calculator accounts for automatically when computing date differences and additions.