Business-Day Oracle

tech.noahsarchPublished by noahsarch.techOfficial publisherv0.1.1Updated Nov 1, 2026

Working days, ISDA conventions and deadlines for 250 countries and 30 financial markets.

VerifiedStreamable HTTPWeb executableProductivity & Workflow Finance

Server details

Identifier: tech.noahsarch/business-day-oracle
Transport: Streamable HTTP
Runtime: Web executable
Trust: Verified
Published: Nov 1, 2026

Security note

MCP servers receive tool arguments from a conversation and may perform external actions. Review what a server can do before you enable it, and give it only the access it needs.

The registry verified that this server's namespace belongs to noahsarch.tech, which also runs its endpoint. That identifies the publisher; it does not make the server's tools safe.

SourceWeft's checks cover whether the listing is complete and the endpoint answered; they do not review the server's code or what its tools do.

Add a badge to your README

Show readers this MCP server is listed on SourceWeft. The badge links to this page.

[![Listed on SourceWeft](https://sourceweft.com/badge/mcp/tech.noahsarch%2Fbusiness-day-oracle.svg)](https://sourceweft.com/mcp/tech.noahsarch%2Fbusiness-day-oracle?utm_source=readme&utm_medium=badge)

Overview

AI-generated overview

Remote MCP server for working-day and holiday arithmetic across 250 countries and 30 financial markets, including ISDA date conventions and deadline…

What you can do: Check whether a date is a working day and why not (weekend, holiday, observed or projected lunar holiday)
Add or count working days between dates, listing every skipped day and its reason
Roll dates by business-day conventions such as following, modified following, preceding and modified preceding
Compute period deadlines from rules like 'within 30 calendar days' or '10 working days', with a step-by-step explanation
List a year's holidays or the next upcoming holidays for a country, subdivision or market
Discover available calendars, weekend rules, subdivision codes and year ranges
When to use it: Useful when an assistant has to answer date questions that depend on real holiday calendars: delivery promises, SLA clocks, payment and coupon dates, settlement, leave cost or lateness in business days, across many countries or exchange calendars.
Requirements: A remote streamable HTTP endpoint; nothing to install locally. An API key sent in the X-API-Key header is available on request by email, but the catalogue and free tools work without it.

Before you install

Lunar and moon-sighted holidays are projections until officially announced, so results carry a data_confidence flag and estimated items that should be relayed rather than treated as final. The server returns a disclaimer with deadline calculations. No write actions are described.

Installation

In SourceWeft

Open Business-Day Oracle in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/tech.noahsarch%2Fbusiness-day-oracle/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "business-day-oracle": {
      "type": "http",
      "url": "https://bizday.noahsarch.tech/mcp"
    }
  }
}

Tools

is_working_day

Is this date a working day?

Say whether a date is a working day in a country/subdivision or market, and why not (weekend, holiday name, holiday observed, projected lunar holiday). Example: date '2027-03-10', country 'SA'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

Parametersdaterequiredmarketcountryweekendlanguagecategoriessubdivisionextra_holidaysinclude_estimated_holidays

add_working_days

Add or subtract working days

Move N working days from a date, skipping weekends and holidays; returns the end date and every skipped day with its reason. Delivery promises, SLA clocks, payment terms in business days. Example: start_date '2026-12-23', days 5, country 'DE', subdivision 'BY'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

Parametersdaysrequiredmarketcountryweekendlanguagecategoriesstart_daterequiredsubdivisionextra_holidayscount_start_dayinclude_estimated_holidays

working_days_between

Count working days between two dates

Count working days between two dates with endpoint control; lists the non-working days. Leave cost, lateness, elapsed business days. Example: '2026-05-18' → '2026-06-05', country 'AE', inclusive 'both'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

Parametersmarketcountryweekendend_daterequiredlanguageinclusivecategoriesstart_daterequiredsubdivisionextra_holidaysinclude_estimated_holidays

roll_date

Adjust a date by business-day convention

Apply a business-day convention (following, modified following, preceding, modified preceding) to a date on a country or market calendar — payment dates, coupon dates, settlement, SLA due dates. Example: date '2026-05-31', convention 'modified_following', market 'XLON'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

Parametersdaterequiredmarketcountryweekendlanguagecategoriesconventionsubdivisionextra_holidaysinclude_estimated_holidays

compute_deadline

Compute a deadline with an explanation trail

Compute the end of a period ('within 30 calendar days', '10 working days', '3 months') from a start date under explicit counting rules, roll it by the chosen convention when it lands on a non-working day, and return raw vs final deadline, skipped days and a step-by-step explanation plus a disclaimer. Pass the rules the contract/law states; defaults are the common ones. Example: start_date '2026-11-26', period 7, unit 'calendar_days', country 'GB'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

Parametersunitrequiredmarketperiodrequiredcountryweekendlanguagecategoriesconventionstart_daterequiredsubdivisionextra_holidaysmonth_end_clamp+2 more

list_holidays

List holidays for a year

All holidays of a year for a country/subdivision/categories or a market, each with local and English names, whether it is observed/shifted, projected (lunar), on a weekend, and whether it counts as non-working. Example: year 2027, country 'IN', subdivision 'KA'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

Parametersyearrequiredmarketcountryweekendlanguagecategoriessubdivisionextra_holidaysinclude_estimated_holidays

next_holiday

Next holiday(s) from a date

The next N holidays on or after a date with days_until and projection flags. Example: from_date '2026-11-01', country 'JP', count 3. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

Parameterscountmarketcountryweekendlanguagefrom_daterequiredcategoriessubdivisionextra_holidaysinclude_estimated_holidays

list_calendars

Supported countries, markets, subdivisions, weekends

Discover calendars: without arguments, all 250 countries and 30 markets; with a country code, its legal weekend, subdivision codes, holiday categories, languages, year range and public sources. Free. Example: country 'US'. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

Parameterscountry

Version history

v0.1.1LatestNov 1, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

Reached in the last 30 daysRequired25 pts
Auth declaredRequired10 pts
Tools listedRequired15 pts
DescriptionRequired15 pts
Logo10 pts
Documentation15 pts
Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.
LicenseNot applicable
A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.