Working Days API

About the Working Days API

Pass a two-letter country code and a month number. The API returns totals for working and non-working days plus a list of working dates formatted as YYYY-MM-DD. Each non-working day specifies reasons such as weekends or public holidays, with holiday names included when applicable. Paid plans can set a custom year.

What people use it for

Monthly Payroll Proration

Payroll engines prorate mid-month employee salaries by dividing base pay by the exact working day count for that territory.

Project Deadline Forecasting

To forecast delivery deadlines accurately, task management software skips weekends and recognized national holidays across regional teams.

Retainer Invoice Calculations

When billing client retainer hours monthly, invoicing software checks total available business days to adjust expected service levels.

Leave Balance Deductions

Determine how many days to deduct from employee leave balances by matching vacation requests against official non-working dates.

Ways to call it

One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.

JSON

Default REST response

XML

Markup format

YAML

Human-readable

CSV

Tabular export

Beta

GraphQL

Query language

New

MCP

For AI agents

Request parameters — GET /v1/workingdays

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.

Required

Optional

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curl "https://api.apiverve.com/v1/workingdays?country=US&month=10&year=2023" \
  -H "x-api-key: YOUR_API_KEY"

Authentication

Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.

Response — GET /v1/workingdays

Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.

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{
  "status": "ok",
  "error": null,
  "data": {
    "workingDaysCount": 21,
    "nonWorkingDaysCount": 10,
    "workingDays": [
      "2023-10-02",
      "2023-10-03",
      "2023-10-04",
      "2023-10-05",
      "2023-10-06",
      "2023-10-10",
      "2023-10-11",
      "2023-10-12",
      "2023-10-13",
      "2023-10-16",
      "2023-10-17",
      "2023-10-18",
      "2023-10-19",
      "2023-10-20",
      "2023-10-23",
      "2023-10-24",
      "2023-10-25",
      "2023-10-26",
      "2023-10-27",
      "2023-10-30",
      "2023-10-31"
    ],
    "nonWorkingDays": [
      {
        "date": "2023-10-01",
        "reasons": [
          "weekend"
        ],
        "holiday_name": null
      },
      {
        "date": "2023-10-07",
        "reasons": [
          "weekend"
        ],
        "holiday_name": null
      },
      {
        "date": "2023-10-08",
        "reasons": [
          "weekend"
        ],
        "holiday_name": null
      },
      {
        "date": "2023-10-09",
        "reasons": [
          "public holiday"
        ],
        "holiday_name": "Columbus Day"
      },
      {
        "date": "2023-10-14",
        "reasons": [
          "weekend"
        ],
        "holiday_name": null
      },
      {
        "date": "2023-10-15",
        "reasons": [
          "weekend"
        ],
        "holiday_name": null
      },
      {
        "date": "2023-10-21",
        "reasons": [
          "weekend"
        ],
        "holiday_name": null
      },
      {
        "date": "2023-10-22",
        "reasons": [
          "weekend"
        ],
        "holiday_name": null
      },
      {
        "date": "2023-10-28",
        "reasons": [
          "weekend"
        ],
        "holiday_name": null
      },
      {
        "date": "2023-10-29",
        "reasons": [
          "weekend"
        ],
        "holiday_name": null
      }
    ]
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Response headers

Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.

What a call costs — 2 credits per call

Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.

Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.

Zero-code embed — one snippet, no backend

Drop an interactive Working Days form onto any page. The widget calls the API for you, so no key ever appears in your markup and there is nothing to deploy.

Changelog — Working Days API

Every change to this endpoint, newest first. Breaking changes ship as a new version and the previous one keeps serving — response fields are added, never removed or retyped in place, so an integration written against v1 keeps working.

Currently v1