{"uid":"cap_A3UU75Sx1TOJgV5rAioYD","slug":"dst-transitions-lookup-7c4f1524","name":"DST Transitions Lookup","description":"Daylight saving transitions of an IANA time zone in a year: exact UTC instants, offsets before and after, and the clock change.","url":"https://timezone-time.x402tookit.com/dst-info?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"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"]}}}}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_pasgUAPvRe1pasSRlznzW","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"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.","exampleUseCases":[{"title":"Scheduling app DST boundary detection","prompt":"I need to know the exact UTC instants when daylight saving time starts and ends in Europe/London for 2025, along with the offset before and after each change, so I can handle scheduling correctly."},{"title":"Verify if a time zone observes DST","prompt":"Does Asia/Tokyo observe daylight saving time in 2025? If so, when do the transitions happen and how much do the clocks change?"},{"title":"Historical DST lookup for a past year","prompt":"Can you look up all the DST transitions that happened in America/Los_Angeles back in 2010 — I need the UTC timestamps and the before/after offsets for each one."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:19:01.454Z","isFirstParty":false,"canonicalSlug":"dst-transitions-lookup-7c4f1524"}