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Business days Settlement Calendars API + MCP Method

Public beta

Business-day calculator

Count the days that
actually count.

Use one calendar or combine several. A day counts only when every selected calendar is open.

Starting dateBusiness days

Calendar intersection

The starting date is not counted. Negative values count backward.

Your calculation trace will appear here.

Exact semantics

Intersection, not intuition.

If you select XNYS and US-FEDERAL, a date must be open on both calendars. NYSE partial sessions count as business days and remain visibly marked.

Read the calculation contract →

Business dates, with proof.

Source status Planned pricing Methodology Developer API

Informational tooling, not legal, financial, or trading advice. Always confirm material deadlines with the responsible institution.