UtiliNest.

Date & Time Tools

Business Days Calculator

Count Monday-to-Friday business days between dates and optionally exclude your own holidays.

Reviewed July 27, 2026 Runs locally No sign-up
Global Monday-Friday modelExact or deterministic
=Your result will appear here

Enter values and calculate.

APPLICABILITY

Where this result fits

Region
Global Monday-Friday model · Holiday calendars are regional
Result type
Exact or deterministic
Standards basis
ISO 8601 date and time format
Edition / version
ISO 8601-1:2019 / ISO 8601-2:2019 and IANA time-zone references; implementation reviewed July 27, 2026

Important: This is not a legal-deadline calculator. Enter the holidays that apply and confirm court, bank, market, employer, and jurisdiction-specific counting rules. Calculator disclaimer

STEP BY STEP

How to use the Business Days Calculator

  1. Enter the requested calendar dates or times.
  2. Choose any options that affect which days or time zones are counted.
  3. Calculate and review the result together with the stated assumptions.
  4. Copy the result if you need to use it elsewhere.

ACCURACY & LIMITS

What to know before using the result

HELP

Frequently asked questions

How accurate is the Business Days Calculator?

The calculator uses the formula shown on this page and keeps full numeric precision internally before formatting the result. There is no universal holiday calendar. Enter the official holiday dates that apply to your country, region, employer, bank, or market.

Does the Business Days Calculator upload my input?

No. The calculation or processing runs locally in your browser. UtiliNest does not receive or store the values you enter.

Can I use the Business Days Calculator on a phone?

Yes. The inputs, result controls, and explanatory content are designed for current mobile and desktop browsers.

Where does the Business Days Calculator apply?

Applicability: Global Monday-Friday model, Holiday calendars are regional. Result classification: Exact or deterministic. This is not a legal-deadline calculator. Enter the holidays that apply and confirm court, bank, market, employer, and jurisdiction-specific counting rules.

SOURCES

Definitions and references

Reviewed against the references below on July 27, 2026. Links open the source publisher's website. Read the source policy

ISO 8601 date and time format

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