{"uid":"cap_EPHXCcLvr7sCkZpkMSKJF","slug":"julian-date-converter-e1dabc0f","name":"Julian Date Converter","description":"Compute the astronomical Julian Date (JD, fractional, epoch noon 1 Jan 4713 BC) and Modified Julian Date (MJD = JD − 2400000.5) of a UTC instant. Unlike `calendar`'s integer Julian Day Number, this carries the time-of-day fraction.","url":"https://astro.openverbs.com/v1/julian-date","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","month","day"],"properties":{"day":{"type":"integer","maximum":31,"minimum":1},"hour":{"type":"integer","maximum":23,"minimum":0,"description":"UTC hour. Default 0."},"year":{"type":"integer","maximum":9999,"minimum":1},"month":{"type":"integer","maximum":12,"minimum":1},"minute":{"type":"integer","maximum":59,"minimum":0,"description":"Default 0."},"second":{"type":"integer","maximum":59,"minimum":0,"description":"Default 0."}},"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_puecDZ2gdepCxOJjQIS0M","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":"Converts a calendar date and time (year, month, day, hour, minute, second) to its Julian Date Number","exampleAgentPrompt":"What is the Julian Date Number for April 12, 2025 at 14:30:00 UTC?","exampleUseCases":[{"title":"Astronomical event timing calculation","prompt":"Calculate the Julian Date for the night of August 12, 2025 at 22:00 UTC — I need it for planning meteor shower observations."},{"title":"Historical date conversion for research","prompt":"What is the Julian Day Number for January 1, 1900 at midnight UTC? I need it to compute the time elapsed since a historical astronomical baseline."},{"title":"Epoch offset computation for software","prompt":"Convert December 31, 2000 at 12:00:00 UTC to a Julian Date Number so I can calculate offsets from the J2000.0 epoch in my orbital mechanics tool."}],"resultDescription":"Returns the Julian Date (JD) — a continuous count of days since the beginning of the Julian Period (January 1, 4713 BC noon). The numeric value represents the precise point in time as a decimal day number, usable for astronomical calculations, time-interval arithmetic, or epoch comparisons.","failureModes":["Invalid month value (outside 1–12) returns a validation error","Invalid day value (outside 1–31) returns a validation error","Year outside 1–9999 range is rejected","Missing required fields (year, month, day) returns a 400-level error","Payment failure via x402 prevents the call from completing"],"whenToPreferThis":"Choose this endpoint when you need a fast, authoritative conversion from a Gregorian calendar date-time to a Julian Date Number for astronomical, scientific, or historical time-interval computations. It is ideal for agents handling celestial event scheduling, orbital mechanics, or any domain where Julian Day Numbers are required as inputs to further calculations.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:31:40.058Z","isFirstParty":false}