How do I count days between two dates?

Enter both dates and the calculator returns the elapsed calendar-day count under the displayed convention, including leap-day effects where applicable.

Can it show years and months too?

Yes. It automatically provides a calendar breakdown into years, months, and days in addition to total elapsed days.

Date Difference Calculator

Count elapsed calendar-day boundaries and view a years-months-days breakdown.

Elapsed-day convention

Total days counts calendar-day boundaries between the two dates. The earlier date is excluded, the later date is included, and equal dates return zero. Dates are compared without a time of day.

Start Date

End Date

Explore More Time Tools

Continue with related pages to compare results and improve decision making.

View Time Category Read the Date Difference Calculator Guide

How This Date Difference Calculator Works

This date difference calculator shows the absolute interval as total days, complete weeks, day-equivalent hours and minutes, plus a calendar years-months-days breakdown.

Formula and Calculation

The core formula used by this date difference calculator is: Total days = the absolute number of calendar-day boundaries between the two dates; the same interval is also split into calendar years, months, and remaining days.

Dates are treated as calendar dates without a time of day. The earlier date is excluded, the later date is included, equal dates return zero, and the calendar breakdown constrains month-end dates.

For general project planning, the calculator can compare two calendar dates under its displayed convention. Apply separate business-day, inclusive-counting, contractual, or regulatory rules when required.

How to Use This Calculator

Select start date and end date.
Review the displayed elapsed-day convention.
Read the calendar breakdown and automatically generated totals.
Verify any separate inclusive-counting or regulatory rule before using the result for compliance.

Why Use This Date Difference Calculator?

Quickly find days between important dates.
Avoid calendar math mistakes in planning.
Useful for general planning, reminders, and milestones.
Supports both simple and detailed duration views.

Related Tools and Guides

Try the Age Calculator for a related calculation.
Try the Time Duration Calculator for a related calculation.
Read the Date Difference Calculator Guide for examples and assumptions.
Browse the Time Calculators page for more tools.

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