How is the date difference calculated?

The tool calculates the exact number of calendar days between the two dates, then converts that into weeks, months, and years.

Can I use this to calculate my age?

Yes. Enter your birth date as the start date and today as the end date. Or use the dedicated Age Calculator for more detail.

Does it include the start date in the count?

The count begins the day after the start date. For example, January 1 to January 3 = 2 days.

Date Difference Calculator

Calculators· 14 tools

Free online date difference calculator. Enter any two dates and instantly find out the exact gap in days, weeks, months, and years. Perfect for project deadlines, anniversaries, and planning. No signup required.

Start Date

End Date

Select two dates to see the difference

Frequently Asked Questions

References

ISO 8601 — Date and time representations — International Organization for Standardization

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Frequently Asked Questions

References and sources

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