fourzerotwo-si

fourzerotwo-si Time API

Time Zones & Business Days: DST-aware time-zone conversion that flags ambiguous and skipped local times, zone facts with the next clock change, and business days for 40+ countries.

Documentation GitHub OpenAPI

Operations 5

GET /v1/time/convert Time Zones & Business Days: Convert a local time between zones #

GET /v1/time/now Time Zones & Business Days: Current time in a zone #

GET /v1/time/zone-info Time Zones & Business Days: Time zone facts #

GET /v1/time/business-days Time Zones & Business Days: Business days (any country) #

GET /v1/time/signed Time Zones & Business Days: Paid test call #

Specifications

⚙

OpenAPI

https://artifacts.apis.io/fourzerotwo-si/openapi/fourzerotwo-si-time-api-openapi.yml

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OpenAPI Specification

openapi: 3.2.0
info:
  title: Fourzerotwo Si Time API
  version: 1.1.0
  contact:
    url: https://fourzerotwo.si
  description: 'Operations tagged time across 2 of this provider''s published API definitions: openapi.json, fourzerotwo-si-openapi.json. Each path carries the servers of the definition it was published in.'
servers:
- url: https://fourzerotwo.si
tags:
- name: Time
  description: 'Time Zones & Business Days: DST-aware time-zone conversion that flags ambiguous and skipped local times, zone facts with the next clock change, and business days for 40+ countries.'
paths:
  /v1/time/convert:
    get:
      operationId: time__convert
      summary: 'Time Zones & Business Days: Convert a local time between zones'
      description: 'Convert a wall-clock time from one IANA zone to another; says when it is ambiguous (clocks go back) or never happens (clocks go forward). Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
      tags:
      - Time
      externalDocs:
        url: https://fourzerotwo.si/apis/time/convert
      parameters:
      - name: time
        in: query
        required: true
        description: Local time YYYY-MM-DDTHH:MM[:SS], no offset
        schema:
          type: string
          maxLength: 25
        example: 2026-10-25T01:30
      - name: from
        in: query
        required: true
        description: IANA zone of that time
        schema:
          type: string
          maxLength: 64
        example: Europe/London
      - name: to
        in: query
        required: true
        description: IANA zone to convert to
        schema:
          type: string
          maxLength: 64
        example: America/New_York
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.001000'
      x-free-tier: free
      x-mcp-tool: time__convert
    servers:
    - url: https://fourzerotwo.si
  /v1/time/now:
    get:
      operationId: time__now
      summary: 'Time Zones & Business Days: Current time in a zone'
      description: 'Local time, UTC, offset, abbreviation, DST flag, weekday and ISO week for a zone. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
      tags:
      - Time
      externalDocs:
        url: https://fourzerotwo.si/apis/time/now
      parameters:
      - name: zone
        in: query
        required: false
        description: IANA zone (default UTC)
        schema:
          type: string
          maxLength: 64
        example: Asia/Tokyo
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.001000'
      x-free-tier: free
      x-mcp-tool: time__now
    servers:
    - url: https://fourzerotwo.si
  /v1/time/zone-info:
    get:
      operationId: time__zone_info
      summary: 'Time Zones & Business Days: Time zone facts'
      description: 'Offset, abbreviation and DST at a moment, plus the next clock change, for an IANA zone. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
      tags:
      - Time
      externalDocs:
        url: https://fourzerotwo.si/apis/time/zone-info
      parameters:
      - name: zone
        in: query
        required: true
        description: IANA zone
        schema:
          type: string
          maxLength: 64
        example: Australia/Sydney
      - name: at
        in: query
        required: false
        description: Date/time to evaluate (default now)
        schema:
          type: string
          maxLength: 30
        example: '2026-12-01'
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.001000'
      x-free-tier: free
      x-mcp-tool: time__zone-info
    servers:
    - url: https://fourzerotwo.si
  /v1/time/business-days:
    get:
      operationId: time__business_days
      summary: 'Time Zones & Business Days: Business days (any country)'
      description: 'Count business days between two dates, or add business days to a date, skipping weekends and the country''s public holidays. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
      tags:
      - Time
      externalDocs:
        url: https://fourzerotwo.si/apis/time/business-days
      parameters:
      - name: country
        in: query
        required: true
        description: ISO country code
        schema:
          type: string
          maxLength: 40
        example: DE
      - name: from
        in: query
        required: true
        description: Start date YYYY-MM-DD
        schema:
          type: string
          maxLength: 10
        example: '2026-12-18'
      - name: to
        in: query
        required: false
        description: End date YYYY-MM-DD (count mode)
        schema:
          type: string
          maxLength: 10
      - name: days
        in: query
        required: false
        description: Business days to add (add mode; negative goes back)
        schema:
          type: integer
        example: 5
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.001000'
      x-free-tier: free
      x-mcp-tool: time__business-days
    servers:
    - url: https://fourzerotwo.si
  /v1/time/signed:
    get:
      operationId: time__signed
      summary: 'Time Zones & Business Days: Paid test call'
      description: 'Server UTC time and a request id. The cheapest paid endpoint: use it to test an x402 payment end to end. Price: $0.001 USDC per call via x402.'
      tags:
      - Time
      externalDocs:
        url: https://fourzerotwo.si/apis/time/signed
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.001000'
      x-mcp-tool: time__signed
    servers:
    - url: https://fourzerotwo.si
components:
  responses:
    PaymentRequired:
      description: x402 payment required. The body (also base64 in the PAYMENT-REQUIRED header) lists accepted payments.
      headers:
        PAYMENT-REQUIRED:
          schema:
            type: string
          description: Base64 JSON x402 v2 PaymentRequired
      content:
        application/json:
          schema:
            type: object
            properties:
              x402Version:
                type: integer
              error:
                type: string
              accepts:
                type: array
                items:
                  type: object
    Error:
      description: 400 = invalid input, 404 = not found at the source, 502 = the source failed. Never charged.
      content:
        application/json:
          schema:
            type: object
            properties:
              error:
                type: string
              charged:
                type: boolean
  securitySchemes:
    freeKey:
      type: apiKey
      in: header
      name: X-API-Key
      description: Optional free key (fzt_…) for the free tier.
x-refined-from:
- openapi.json
- fourzerotwo-si-openapi.json