Processing boundary
Input is processed only in the active browser tab's memory and is not sent to a ByteQuant server.
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Calculation tools
Business Day Calculator
Counts Monday-to-Friday dates between two endpoints using UTC-safe date arithmetic and excludes optional ISO holiday dates. It is not an official employment calendar or legal deadline calculation.
✓ Free✓ No account✓ In-browser
Persistent storage
Input and output are not stored. The optional usage counter keeps only tool identity and count, never content.
Verification
Output comes from disclosed rules or browser APIs and needs independent review before high-impact use.
A result in three steps
- 01
Enter start, end, and optional holidays.
- 02
Run the calculation with the stated inclusion rule.
- 03
Verify official holidays and legal rules with an authoritative source.
When is this tool useful?
- ✓ Project-duration estimates
- ✓ Delivery-date comparison
- ✓ Preliminary SLA calculations
Important limitation
Automated output is a preliminary assessment. Do not use it alone for legal, financial, medical, or security-critical decisions.
LEARN THE WORKFLOW
Guides for this tool
Time-Zone and Business-Day Planning for Global Teams
Plan meetings and delivery dates more safely by making daylight-saving, holiday, and inclusion rules visible.
Read guide →ABOUT THIS TOOL
Frequently asked questions
Does this tool send input to a server?+
No. Processing runs in this browser tab. Data leaves the page only when you choose to copy or download the result.
Is the result definitive?+
The tool produces consistent output from disclosed rules and browser APIs, but context, data quality, and method limitations can affect it. Verify high-impact decisions.
Is input saved?+
No. Tool input is not persisted. With consent, only tool identity and usage count may be kept on this device for personal shortcuts.