What does "Include end date" do?

By standard calendar convention, the interval between today and tomorrow is 1 day. Enabling "Include end date" treats the period inclusively (useful for counting vacation days, project billing, or booking spans).

Can I enter dates in reverse order?

Yes. If the end date is earlier than the start date, the calculator automatically calculates the exact elapsed time and indicates that the range spans into the past.

What does "Include end date" do?

By standard calendar convention, the interval between today and tomorrow is 1 day. Enabling "Include end date" treats the period inclusively (useful for counting vacation days, project billing, or booking spans).

Can I enter dates in reverse order?

Yes. If the end date is earlier than the start date, the calculator automatically calculates the exact elapsed time and indicates that the range spans into the past.

Your Base64 data stays in your browser. Client-side only

Date Duration Calculator

Calculate exact calendar days, weeks, months, and years between two dates using true calendar arithmetic and leap year awareness.

Choose Date Range

Quick Presets

Start Date

End Date

Include end date in count (e.g. for vacation or contract days: +1 day)

Total Days Duration

100days

Calendar Breakdown

3 months, 8 days

Weeks & Days

14 weeks + 2 days

Workdays vs Weekends

72 workdays (28 weekend)

Frequently Asked Questions

Clear, concise answers to common questions about Base64 decoding, encoding, and specifications.

It uses exact calendar arithmetic rather than approximating months as 30 days. It accounts for 28, 29 (in leap years), 30, and 31-day months to give you exact years, months, and days.

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