Calendar Converter
Calendar converter: convert a Gregorian date to other calendar systems: Islamic (both the tabular civil calendar and the Umm al-Qura variant), Hebrew, Japanese imperial era, Republic of China, Buddhist and Persian. Also computes Easter Sunday for a year in both the Gregorian and Julian reckonings. Uses the calendar support built into the runtime, with the algorithm named in every response.
Offering
- Provider
- api.duoleads.com
- Method
- GET
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- General Utilities
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://api.duoleads.com/v1/time/calendar- MIME type
- application/json
- First seen
- 2026-10-16T01:50:38.788Z
- Last seen
- Tags
- calendar, calendar-converter, hijri, Time
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.05 USDC
Atomic price: 50000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "50000",
"payTo": "0xCD673f7e1daD254347AEab6be0DEFe8b9C6b3A39"
}
]Observed health
- Status
- Healthy
- Latest latency
- 36 ms
- Average latency
- 293 ms
- HTTP status
- 402
- Last checked
- Reachability
- 100% over 13 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"GET"
]
},
"queryParams": {
"type": "object",
"properties": {
"op": {
"type": "string",
"description": "convert (default) a Gregorian date, or easter for a year.",
"enum": [
"convert",
"easter"
],
"maxLength": 64,
"default": "convert"
},
"date": {
"type": "string",
"description": "Gregorian date YYYY-MM-DD. Required when op=convert.",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"maxLength": 32
},
"to": {
"type": "string",
"description": "Comma-separated calendar ids: islamic, islamic-umalqura, hebrew, japanese, roc, buddhist, persian. Default all.",
"maxLength": 256
},
"year": {
"type": "string",
"description": "Year for op=easter, 326-9999.",
"pattern": "^[+-]?\\d+$",
"maxLength": 64
},
"rite": {
"type": "string",
"description": "Easter reckoning: western (default) or eastern.",
"enum": [
"western",
"eastern"
],
"maxLength": 64,
"default": "western"
}
},
"required": []
}
},
"required": [
"type",
"method"
],
"additionalProperties": false
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"date": {
"description": "Gregorian date YYYY-MM-DD. Required when op=convert.",
"maxLength": 32,
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"type": "string"
},
"op": {
"default": "convert",
"description": "convert (default) a Gregorian date, or easter for a year.",
"enum": [
"convert",
"easter"
],
"maxLength": 64,
"type": "string"
},
"rite": {
"default": "western",
"description": "Easter reckoning: western (default) or eastern.",
"enum": [
"western",
"eastern"
],
"maxLength": 64,
"type": "string"
},
"to": {
"description": "Comma-separated calendar ids: islamic, islamic-umalqura, hebrew, japanese, roc, buddhist, persian. Default all.",
"maxLength": 256,
"type": "string"
},
"year": {
"description": "Year for op=easter, 326-9999.",
"maxLength": 64,
"pattern": "^[+-]?\\d+$",
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"properties": {
"algorithm": {
"type": "string"
},
"calendars": {
"additionalProperties": {
"properties": {
"algorithm": {
"type": "string"
},
"day": {
"type": "integer"
},
"era": {
"type": "string"
},
"formatted": {
"type": "string"
},
"month": {
"type": "integer"
},
"month_name": {
"type": "string"
},
"year": {
"type": "integer"
}
},
"required": [
"year",
"month",
"month_name",
"day",
"era",
"formatted",
"algorithm"
],
"type": "object"
},
"description": "keyed by caller-chosen names",
"type": "object"
},
"date": {
"type": "string"
},
"gregorian": {
"type": "string"
},
"gregorian_date": {
"type": "string"
},
"julian_date": {
"type": "string"
},
"rite": {
"type": "string"
},
"unavailable": {
"additionalProperties": {
"type": "string"
},
"description": "keyed by caller-chosen names",
"type": "object"
},
"year": {
"type": "integer"
}
},
"type": "object"
},
"meta": {
"properties": {
"computed_at": {
"description": "RFC 3339 UTC with milliseconds",
"type": "string"
},
"deterministic": {
"type": "boolean"
},
"disclaimer": {
"type": "string"
},
"price_usd": {
"type": "string"
},
"request_id": {
"type": "string"
},
"sources": {
"items": {
"required": [
"id",
"version",
"published"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"request_id",
"computed_at",
"price_usd",
"deterministic",
"disclaimer"
],
"type": "object"
},
"ok": {
"const": true
},
"route": {
"const": "/v1/time/calendar"
},
"version": {
"type": "string"
}
},
"required": [
"ok",
"route",
"version",
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}