Business-day arithmetic with a caller-supplied calendar
Business-day arithmetic with a caller-supplied calendar: add or subtract N working days from a date, or count the working days between two dates. The weekend is specified as a weekday mask so Friday-Saturday and Sunday-only weeks work, and holidays are passed in as an explicit date list, so the answer never depends on a holiday table that can go stale. Returns the result date, the day count, and the skipped dates with the reason each was skipped.
Answeringour last check, 2026-09-29
1 of 1checks answered this week
19 msmedian answer time
$0.05listed price per call
$0.05price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://api.duoleads.com/v1/time/business-days
| Category | Everything else |
|---|---|
| Provider host | api.duoleads.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-29 | valid payment request | 402 | $0.05 | 19 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"days": "5",
"from": "2026-12-24",
"holidays": "2026-12-25,2026-12-26,2027-01-01"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"days": {
"description": "Business days to add, -3650 to 3650. Required when op=add.",
"maxLength": 64,
"pattern": "^[+-]?\\d+$",
"type": "string"
},
"from": {
"description": "Start date, YYYY-MM-DD.",
"maxLength": 32,
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"type": "string"
},
"holidays": {
"description": "Comma-separated YYYY-MM-DD holiday dates.",
"maxLength": 2048,
"type": "string"
},
"inclusive": {
"default": "start",
"description": "For op=count: start (default, half-open [from, to)), both or neither.",
"enum": [
"start",
"both",
"neither"
],
"maxLength": 64,
"type": "string"
},
"op": {
"default": "add",
"description": "add (default) N business days to from, or count business days between from and to.",
"enum": [
"add",
"count"
],
"maxLength": 64,
"type": "string"
},
"to": {
"description": "End date YYYY-MM-DD, may precede from. Required when op=count.",
"maxLength": 32,
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"type": "string"
},
"weekend": {
"default": "sat,sun",
"description": "Comma-separated weekday names or ISO numbers. Default sat,sun. Empty string = no weekend.",
"maxLength": 64,
"type": "string"
}
},
"required": [
"from"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"type": "object"
},
"meta": {
"properties": {
"computed_at": {
"type": "string"
},
"deterministic": {
"type": "boolean"
},
"disclaimer": {
"type": "string"
},
"price_usd": {
"type": "string"
},
"request_id": {
"type": "string"
},
"sources": {
"type": "array"
}
},
"required": [
"request_id",
"computed_at",
"price_usd",
"deterministic",
"disclaimer"
],
"type": "object"
},
"ok": {
"const": true,
"type": "boolean"
},
"route": {
"type": "string"
},
"version": {
"type": "string"
}
},
"required": [
"ok",
"route",
"version",
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}