Date Difference

Projects slip because “about six weeks” ignores weekends, holiday shutdowns, and negative spans when dates flip.

Drop in two dates to see the real distance in days, business days, and months — with inclusive counting and holiday skipping when you need good news for a status report.

Why this helps

Calendar guesses miss that approvals run Monday to Friday, month-end freezes erase whole weeks, and flipped dates quietly break reports.

This tool surfaces the units that actually decide delivery — day totals, workable windows, and the holidays that steal progress.

Plug in the dates below and see if you’re coasting or bleeding buffer.

No accounts. Runs locally. No nonsense.

Results

Public holidays are country-wide only (regional/state holidays aren't included yet).

Start and end order doesn't matter - reversed dates return negative values.

Months use an average length for speed. Use day totals for exact results.

Holiday calendars are cached locally for speed.

Date calculations are timezone-independent.

See the real span

The cards show total days, business days, weeks, and averaged months in one pass, so you can eyeball scope creep, SLA drift, or “how old is this?” without reopening Excel.

Flip inclusive counting on when both endpoints count, and layer in holiday skipping to keep status updates honest.

How to use it well

  • Set the start and end, or use “End = Today” when reporting an in-flight item.
  • Decide whether both endpoints count before you quote a number; inclusive vs exclusive changes HR and legal answers.
  • Turn on business days plus a holiday calendar when stakeholders only care about working time.
  • Keep the link handy — the tool stores settings in the URL so you can revisit the same calculation.

Common gotchas

  • Holiday calendars are national only; regional shutdowns still need manual adjustment.
  • Average-month values keep dashboards light — grab the day count for contractual maths.
  • Forgetting to include both endpoints can shave a day off critical paths or leave notice periods short.
  • Negative spans are deliberate; they flag start dates set in the future or overdue tasks.

Quick answers

Does the order of the dates matter?

No. Reversing them just returns a negative result so you see direction immediately.

What does Inclusive mean?

Both the start and end days count as whole days, matching many HR, payroll, and contract rules.

Which holiday calendars are available?

National sets for the US, UK, much of the EU, Australia, Canada, and a few others. More can be added as needed.

Are regional/state holidays included?

No. The list only covers nationwide public holidays right now.

How accurate are “months”?

They use averaged month lengths for speed. If you need exact precision, rely on day totals.

Does timezone matter?

It’s calendar math only, so the calculation ignores timezone offsets.

Support layers

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Keep exploring

Need a deep dive on inclusive counting, deadline sanity checks, or timestamp formats? These guides extend what you’ve already started here.