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Date Difference Calculator

Calculate the difference between two dates

Last Updated: July 2026
Select start date
Select end date
Whether to count the end date
Total Days
—
Days between dates
Weeks
—
Complete weeks
Months
—
Approximate months

Date Difference Breakdown

UnitValue

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What Is a Date Difference Calculator?

A Date Difference Calculator computes the time elapsed between two dates in various units: days, weeks, months, years, hours, and minutes. It also counts business days (excluding weekends) for project planning.

This calculator is useful for calculating project durations, contract periods, age differences, time between events, and any scenario where you need to know the exact time between two dates.

Date Difference Formula

Total Days = End Date - Start Date
Weeks = Total Days / 7
Months = Total Days / 30.44 (approx)
Business Days = Days excluding Sat-Sun
Total Days = Difference in daysWeeks = Complete weeks + remainingBusiness Days = Mon-Fri only

Frequently Asked Questions

How to calculate days between two dates?
Subtract the start date from the end date. For example, from January 1 to January 31 is 30 days (or 31 if inclusive). This calculator handles all date calculations including leap years and varying month lengths.
What is the difference between inclusive and exclusive counting?
Inclusive counting includes both start and end dates. Exclusive counting excludes one or both dates. For example, January 1 to January 3: inclusive = 3 days (1, 2, 3), exclusive = 2 days (difference).
How many business days are in a month?
A typical month has 20-22 business days (Monday-Friday), excluding weekends. This varies based on the number of days in the month and public holidays. Use the business days count for project planning and salary calculations.
How to calculate months between dates?
Months between dates can be approximate (total days / 30.44) or exact (counting complete months). For example, January 15 to March 20 is 2 months and 5 days exactly, or 2.17 months approximately.
Does this calculator account for leap years?
Yes, this calculator correctly handles leap years. February 29 is counted in leap years (2024, 2028, etc.). The calculator uses JavaScript Date objects which automatically handle leap year calculations.

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