What is a Date Calculator?
A date calculator helps you measure the time between two dates or calculate a date before or after a given number of days, weeks, months, or years.
Date & Time
Date Calculator
Use this date calculator to find the difference between two dates, add or subtract days, and calculate future or past dates instantly.
Days Between
Select dates and settings to calculate instantly.
Date calculations account for actual calendar length, including leap years and varying month lengths where applicable.
Ready to calculate
Select your dates and inputs to calculate durations, weekdays, future dates, countdowns, and more.
Date Calculation Basics
Date Difference
Duration = End Date − Start Date
Future Date
Future Date = Start Date + Number of Days
Past Date
Past Date = Start Date − Number of Days
Examples
Days Between Two Dates
Input: Start Date = Jan 1, End Date = Jan 31
Result: 30 days
10 Days From Today
Input: Start Date = Today, Add 10 days
Result: Future date after 10 days
Date Difference vs Date Duration
Date difference usually refers to the number of days between two calendar dates. Date duration may also include months, years, weeks, hours, or business days depending on the calculator mode.
Frequently Asked Questions
Enter a start date and end date, then subtract the earlier date from the later one to find the total time difference.
Yes. A date calculator can move forward or backward from a selected date by any number of days, weeks, months, or years.
Yes. Accurate date calculators account for leap years and the varying number of days in each month.
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