{"uid":"cap_sHWtLzHEA6vyNZvNd7qY5","slug":"easter-date-calculator-gregorian-d3f1ff2e","name":"Easter Date Calculator (Gregorian)","description":"Compute the date of Western (Gregorian) Easter Sunday for a year in 1583..9999 using the Anonymous Gregorian computus.","url":"https://datetime.openverbs.com/v1/easter","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","required":["year"],"properties":{"year":{"type":"integer","maximum":9999,"minimum":1583}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_tzSlvMh2aLsKxGyDEuT7o","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the exact date of Western (Gregorian) Easter Sunday for any year between 1583 and 9999 using the Anonymous Gregorian computus algorithm.","exampleAgentPrompt":"What date does Easter Sunday fall on in 2026? Use the Gregorian computus calculation.","exampleUseCases":[{"title":"Holiday scheduling for retail planner","prompt":"When is Easter Sunday in 2027? I need the exact date so I can plan our spring sale calendar around it."},{"title":"Liturgical calendar generation","prompt":"Calculate the date of Easter for every year from 2025 to 2035 so I can build out our church's liturgical calendar."},{"title":"Historical Easter date research","prompt":"What was the date of Easter Sunday in the year 1700? I'm doing historical research on 18th-century religious observances."}],"resultDescription":"Returns the exact calendar date of Gregorian Easter Sunday for the requested year, including the month and day, computed via the Anonymous Gregorian computus algorithm.","failureModes":["Year below 1583 or above 9999 returns a validation error — the algorithm only covers the Gregorian calendar period","Missing or non-integer year field causes a 400 bad request","Network timeout or service unavailability returns a 5xx error","Payment failure (x402) blocks the request if USDC balance is insufficient"],"whenToPreferThis":"Use this endpoint when you need a precise, algorithmically correct Gregorian Easter date for any year in the range 1583–9999. It is preferable to a general-purpose LLM answer (which may hallucinate Easter dates) or a manual lookup table. It is specifically for Western/Gregorian Easter, not Orthodox Easter (Julian calendar), so choose accordingly.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:34:21.387Z","isFirstParty":false}