# DST Transitions Lookup

> DST Transitions Lookup is a paid API for AI agents from timezone-time.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Returns all daylight saving time transitions for a given IANA time zone in a specified year, including exact UTC instants, before/after UTC offsets, and the clock change amount.

## Facts

- Endpoint: GET https://timezone-time.x402tookit.com/dst-info?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dst-transitions-lookup-7c4f1524
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A3UU75Sx1TOJgV5rAioYD

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability dst-transitions-lookup-7c4f1524
```

Example prompt: What are all the daylight saving time transitions for America/Chicago in 2025 — give me the exact UTC moments when clocks change, plus the offsets before and after each transition.

## When to prefer this

Choose this endpoint when you need to programmatically determine the exact UTC moments of DST transitions for a time zone in a given year — ideal for scheduling systems, calendar apps, or any workflow that must correctly handle clock changes. Prefer this over a general timezone-conversion endpoint when the specific question is about DST boundaries, not converting a specific datetime.

## Known failure modes

- Invalid or unrecognized IANA time zone string returns an error or empty transitions
- Year outside 1970–2100 range may not be supported
- Time zones with no DST (e.g. Asia/Tokyo) return an empty transitions array
- Degraded mode may indicate reduced data quality via the 'degraded' flag

## How this service works

Daylight saving transitions of an IANA time zone in a year: exact UTC instants, offsets before and after, and the clock change.

## Output

Returns a structured object containing the IANA time zone, the year queried, a list of DST transitions each with the exact UTC timestamp of the transition, the UTC offset before and after, and the clock change amount. Also includes a summary, verdict, and a disclaimer about data source quality.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "tz"
     ],
     "properties": {
      "tz": {
       "type": "string",
       "description": "IANA time zone"
      },
      "year": {
       "type": "integer",
       "description": "Year, 1970 to 2100, default current year"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "tz": {
       "type": [
        "null",
        "string"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "year": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "transitions": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "atUtc": {
          "type": [
           "null",
           "string"
          ]
         },
         "change": {
          "type": [
           "null",
           "string"
          ]
         },
         "offsetAfter": {
          "type": [
           "null",
           "string"
          ]
         },
         "offsetBefore": {
          "type": [
           "null",
           "string"
          ]
         }
        }
       }
      }
 
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dst-transitions-lookup-7c4f1524/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from timezone-time.x402tookit.com](https://www.zero.xyz/host/timezone-time.x402tookit.com/llms.txt)