ferntool-com Date Calc API

The Date Calc API from ferntool-com — 1 operation(s) for date calc.

GitHub OpenAPI

Operations 1

GET /api/date-calc Days between dates, or add/subtract days, weeks, months, years #

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API
curl "https://apis.io/api/v1/apis/ferntool-com:ferntool-com-date-calc-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

ferntool-com-date-calc-api-openapi.yml Raw ↑
openapi: 3.2.0
info:
  title: FernTool Network Date Calc API
  version: 0.14.10
  description: 'Free network API: your IP, IP geolocation with timezone and VPN/Tor/datacenter flags, batch lookup, RDAP WHOIS, DNS, reverse DNS, subnet calculator, timestamps, date maths, time zones, random numbers and random picks. No key. CORS *. Please keep under ~40 network lookups/minute.'
servers:
- url: https://www.ferntool.com
tags:
- name: Date Calc
paths:
  /api/date-calc:
    get:
      operationId: dateCalc
      summary: Days between dates, or add/subtract days, weeks, months, years
      parameters:
      - name: start
        in: query
        required: false
        description: YYYY-MM-DD (default today UTC)
        schema:
          type: string
      - name: end
        in: query
        required: false
        description: YYYY-MM-DD
        schema:
          type: string
      - name: include_end
        in: query
        required: false
        description: true to count the end date
        schema:
          type: string
      - name: add_days
        in: query
        required: false
        description: integer
        schema:
          type: string
      - name: add_weeks
        in: query
        required: false
        description: integer
        schema:
          type: string
      - name: add_months
        in: query
        required: false
        description: integer
        schema:
          type: string
      - name: add_years
        in: query
        required: false
        description: integer
        schema:
          type: string
      - name: business_days
        in: query
        required: false
        description: 'true: add_days skips weekends'
        schema:
          type: string
      responses:
        '200':
          description: Result
          content:
            application/json:
              schema:
                type: object
        '400':
          description: Invalid input
      tags:
      - Date Calc