Julian Day, modified JD and Julian Day Number for a date and UTC time (Gregorian
Julian Day, modified JD and Julian Day Number for a date and UTC time (Gregorian or Julian calendar), or JD back to a date.
Answeringour last check, 2026-10-21
1 of 1checks answered this week
494 msmedian answer time
$0.02listed price per call
$0.02price 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
GET https://calendar-systems.x402tookit.com/julian-day
| Category | Everything else |
|---|---|
| Provider host | calendar-systems.x402tookit.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.02 | 494 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"date": "1957-10-04",
"time": "19:26:24"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"calendar": {
"description": "gregorian (default, proleptic) or julian: how the date is written",
"enum": [
"gregorian",
"julian"
],
"type": "string"
},
"date": {
"description": "YYYY-MM-DD, year -4712 to 9999 (astronomical numbering: year 0 = 1 BCE)",
"type": "string"
},
"jd": {
"description": "A Julian Day to convert to a date instead (0 to 5373484)",
"type": "number"
},
"time": {
"description": "UTC time HH:MM or HH:MM:SS, default 00:00:00",
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"calendarUsed": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"gregorianDate": {
"type": [
"null",
"string"
]
},
"j2000Offset": {
"type": [
"null",
"number"
]
},
"julianCalendarDate": {
"type": [
"null",
"string"
]
},
"julianDay": {
"type": [
"null",
"number"
]
},
"julianDayNumber": {
"type": [
"null",
"number"
]
},
"modifiedJulianDay": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"rataDie": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"weekday": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}