Resolve a local time to an exact UTC instant with explicit DST ambiguity handlin
Resolve a local time to an exact UTC instant with explicit DST ambiguity handling, business-day arithmetic, public-holiday status, and working-hour overlap across timezones. Detects ambiguous and nonexistent local times instead of silently shifting them. Declares its IANA tzdb release and per-jurisdiction holiday provenance.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
1046 msmedian answer time
$0.01listed price per call
$0.01price 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
POST https://chrono.schemasure.com/v1/business-time
| Category | Everything else |
|---|---|
| Provider host | chrono.schemasure.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 42 from 8 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.01 | 1046 ms |
Example input (from the provider)
{
"body": {
"ambiguity_policy": "reject",
"local_time": "2026-11-01T01:30:00",
"timezone": "America/New_York"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"oneOf": [
{
"required": [
"local_time"
]
},
{
"required": [
"instant"
]
}
],
"properties": {
"add_business_days": {
"description": "Move this many working days from the resolved date, skipping the calendar's weekend days and its public holidays. Zero returns the date unchanged.",
"maximum": 365,
"minimum": -365,
"type": "integer"
},
"ambiguity_policy": {
"default": "reject",
"description": "How to read a local time that occurs twice or not at all. Matches Temporal's disambiguation vocabulary. The default, reject, returns verdict \"unknown\" with both candidate instants rather than silently picking one.",
"enum": [
"earlier",
"later",
"compatible",
"reject"
],
"type": "string"
},
"compare_with": {
"description": "Other IANA zones to report the same instant in, and to intersect working hours with.",
"examples": [
[
"Europe/London",
"Asia/Jerusalem"
]
],
"items": {
"type": "string"
},
"maxItems": 5,
"type": "array"
},
"holiday_calendar": {
"description": "Jurisdiction whose public holidays and weekend definition apply. An unlisted value is rejected with UNSUPPORTED; this service never falls back to an empty holiday list.",
"enum": [
"AU-NSW",
"CA-BC",
"CA-ON",
"DE",
"FR",
"GB-ENG",
"GB-NIR",
"GB-SCT",
"IE",
"IL",
"IN",
"JP",
"NL",
"NZ",
"US",
"US-CA",
"US-NY"
],
"type": "string"
},
"instant": {
"description": "An absolute ISO 8601 instant ending in Z or an explicit offset. Alternative to local_time; send exactly one of the two.",
"examples": [
"2026-11-01T05:30:00Z"
],
"type": "string"
},
"local_time": {
"description": "ISO local date and time with NO offset and no Z suffix. This is the field whose meaning can be ambiguous, which is the point of the endpoint.",
"examples": [
"2026-11-01T01:30:00"
],
"pattern": "^\\d{4}-\\d{2}-\\d{2}[T ]\\d{2}:\\d{2}(:\\d{2})?$",
"type": "string"
},
"timezone": {
"description": "IANA timezone identifier, resolved against tzdb 2026c.",
"examples": [
"America/New_York",
"Pacific/Chatham",
"Antarctica/Troll"
],
"minLength": 1,
"type": "string"
},
"working_hours": {
"additionalProperties": false,
"description": "Local business hours, defaulting to 09:00-17:00. end < start means the window crosses midnight.",
"properties": {
"end": {
"pattern": "^([01]\\d|2[0-3]):[0-5]\\d$",
"type": "string"
},
"start": {
"pattern": "^([01]\\d|2[0-3]):[0-5]\\d$",
"type": "string"
}
},
"required": [
"start",
"end"
],
"type": "object"
}
},
"required": [
"timezone"
],
"title": "BusinessTimeRequest",
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"data_versions": {
"description": "Declares the pinned IANA tzdb release, holiday dataset, and Temporal source.",
"type": "object"
},
"evidence": {
"items": {
"type": "object"
},
"type": "array"
},
"ok": {
"type": "boolean"
},
"policy_version": {
"type": "string"
},
"request_hash": {
"type": "string"
},
"result": {
"properties": {
"ambiguity": {
"enum": [
"unique",
"ambiguous",
"nonexistent"
],
"type": "string"
},
"business_days_result": {
"type": [
"object",