$Business Days Calculation$

Business Days Calculation

Math & Calculations Credits / request: 1

Counts business days between dates or adds business days. Country code excludes public holidays.

GET https://api.apikodu.com/api/v1/math/businessdays

Documentation

Overview

Business-day difference or add. Public holidays excluded when countryCode is set.

Authentication

Every request requires the x-api-key header. Credits used and remaining quota are returned in response headers (x-api-credits-used, x-api-remaining-credits, x-rate-limit-*).

Request

GET https://api.apikodu.com/api/v1/math/businessdays?mode=diff&fromDate=2026-01-01&toDate=2026-01-31&countryCode=EE

Query string.

Parameters

Name	Type	Required	Default	Options	Description
`mode`	string	Optional	`diff`	`diff` `add`	diff or add.
`fromDate`	string	* Required	—	—	Start YYYY-MM-DD.
`toDate`	string	Optional	—	—	End for diff.
`days`	integer	Optional	—	—	Business days for add (may be negative).
`countryCode`	string	Optional	—	—	ISO country (EE, TR, DE ...).
`includeBreakdown`	boolean	Optional	`true`	`true` `false`	Holiday breakdown.

Response

Name	Type	Description
`mode`	string	Applied mode: diff or add.
`days`	integer	diff: business days in the range. add: business days added/subtracted.
`fromDate`	string	Normalized start YYYY-MM-DD.
`toDate`	string	diff: end date. add: may stay equal to fromDate.
`resultDate`	string	add: resulting business date YYYY-MM-DD. diff: null.
`countryCode`	string	ISO country code used. Null if omitted (no holiday exclusion).
`holidays`	array	Excluded public holidays. May be empty without countryCode or when includeBreakdown=false.
`holidays[].date`	string	Holiday date YYYY-MM-DD.
`holidays[].name`	string	Holiday name in English.

Errors

HTTP	code	Description
`400`	`-242`	mode is not diff or add.
`400`	`-247`	fromDate missing/invalid. toDate is also required for diff.
`400`	`-241`	days is missing in add mode.
`400`	`-243`	countryCode is not ISO 3166-1 alpha-2 or is unknown.
`401`	`-100`	x-api-key is missing, empty, malformed, inactive, banned, expired, IP-restricted, or not allowed for this API.
`429`	`-221`	Per-minute request limit exceeded. Response headers: x-rate-limit-limit, x-rate-limit-remaining, x-rate-limit-reset.
`429`	—	Package credit quota cannot cover this request. Body may be { error, limit, currentUsage, requestCost } (no code field).
`500`	`-1`	Unexpected server error. message is a generic error text without technical details.

Notes

Success body is { data: { ... } }. Error body is { code, message }. code is an ApiResponseCode enum value (negative integer).

Sample response

{
  "data": {
    "mode": "diff",
    "days": 20,
    "fromDate": "2026-01-01",
    "toDate": "2026-01-31",
    "resultDate": null,
    "countryCode": "EE",
    "holidays": [
      {
        "date": "2026-01-01",
        "name": "New Year's Day"
      }
    ]
  }
}

Code samples

  
      const response = await fetch('https://api.apikodu.com/api/v1/math/businessdays', {
        method: 'GET',
        headers: {
          'x-api-key': 'YOUR_API_KEY'
        }
      });

      const data = await response.json();
      console.log(data);

  
      import requests

      headers = {
          'x-api-key': 'YOUR_API_KEY'
      }

      response = requests.get('https://api.apikodu.com/api/v1/math/businessdays', headers=headers)
      print(response.json())

  
      using var client = new HttpClient();
      client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

      var response = await client.GetStringAsync("https://api.apikodu.com/api/v1/math/businessdays");
      Console.WriteLine(response);

  
      $response = file_get_contents('https://api.apikodu.com/api/v1/math/businessdays', false, stream_context_create([
          'http' => [
              'header' => "x-api-key: YOUR_API_KEY"
          ]
      ]));

      print_r(json_decode($response, true));

  
      curl -X GET 'https://api.apikodu.com/api/v1/math/businessdays' \
        -H 'x-api-key: YOUR_API_KEY'

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