Calendar Systems
Convert a Gregorian date to the Hebrew calendar (or back) with leap year, year type and major holiday dates.
OtherLiveeip155:8453Exactvia cdp
Hebrew-calendarCalendarDatesHolidays
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$24.31
Verified settled volume
1,175 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-20 20:58Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb531320805C5BED1D46AEaDcF4F008FDF172DBDaThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
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"date": "2024-10-03"
}
},
"output": {
"asOf": "2026-10-11T08:54:32.855Z",
"from": "gregorian",
"hebrew": {
"day": 1,
"text": "1 Tishrei 5785",
"year": 5785,
"input": "5785-07-01",
"month": 7,
"holidays": [
{
"name": "Rosh Hashanah (day 1)",
"gregorian": "2024-10-03",
"hebrewDate": "1 Tishrei"
},
{
"name": "Yom Kippur",
"gregorian": "2024-10-12",
"hebrewDate": "10 Tishrei"
}
],
"leapYear": false,
"yearType": "complete",
"monthName": "Tishrei",
"yearLengthDays": 355,
"monthLengthDays": 30,
"roshHashanahGregorian": "2024-10-03",
"monthNumberFromTishrei": 1
},
"source": "Reingold and Dershowitz, Calendrical Calculations: Hebrew calendar arithmetic, computed locally",
"reasons": [
"Arithmetic Hebrew calendar (molad rules with the four postponements); months are numbered from Nisan = 1, so Tishrei = 7.",
"Hebrew days begin at sunset: the evening before the Gregorian date belongs to the Hebrew date shown."
],
"summary": "2024-10-03 (Thursday) is 1 Tishrei 5785 in the Hebrew calendar.",
"verdict": "CONVERTED",
"weekday": "Thursday",
"degraded": false,
"gregorian": {
"day": 3,
"iso": "2024-10-03",
"year": 2024,
"month": 10,
"weekday": "Thursday"
},
"supported": true,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"sunset: the Hebrew day starts the evening before, so observance begins at sunset of the previous Gregorian day",
"holidays other than the seven listed, and Diaspora versus Israel second days",
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"hebrewDate": "10 Tishrei"
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"monthName": "Tishrei",
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"roshHashanahGregorian": "2024-10-03",
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"source": "Reingold and Dershowitz, Calendrical Calculations: Hebrew calendar arithmetic, computed locally",
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"Hebrew days begin at sunset: the evening before the Gregorian date belongs to the Hebrew date shown."
],
"summary": "2024-10-03 (Thursday) is 1 Tishrei 5785 in the Hebrew calendar.",
"verdict": "CONVERTED",
"weekday": "Thursday",
"degraded": false,
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"day": 3,
"iso": "2024-10-03",
"year": 2024,
"month": 10,
"weekday": "Thursday"
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"supported": true,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"sunset: the Hebrew day starts the evening before, so observance begins at sunset of the previous Gregorian day",
"holidays other than the seven listed, and Diaspora versus Israel second days",
"…1 more"
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"asOf": "2026-10-11T08:54:32.855Z",
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"hebrew": {
"day": 1,
"text": "1 Tishrei 5785",
"year": 5785,
"input": "5785-07-01",
"month": 7,
"holidays": [
{
"name": "Rosh Hashanah (day 1)",
"gregorian": "2024-10-03",
"hebrewDate": "1 Tishrei"
},
{
"name": "Yom Kippur",
"gregorian": "2024-10-12",
"hebrewDate": "10 Tishrei"
}
],
"leapYear": false,
"yearType": "complete",
"monthName": "Tishrei",
"yearLengthDays": 355,
"monthLengthDays": 30,
"roshHashanahGregorian": "2024-10-03",
"monthNumberFromTishrei": 1
},
"source": "Reingold and Dershowitz, Calendrical Calculations: Hebrew calendar arithmetic, computed locally",
"reasons": [
"Arithmetic Hebrew calendar (molad rules with the four postponements); months are numbered from Nisan = 1, so Tishrei = 7.",
"Hebrew days begin at sunset: the evening before the Gregorian date belongs to the Hebrew date shown."
],
"summary": "2024-10-03 (Thursday) is 1 Tishrei 5785 in the Hebrew calendar.",
"verdict": "CONVERTED",
"weekday": "Thursday",
"degraded": false,
"gregorian": {
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"iso": "2024-10-03",
"year": 2024,
"month": 10,
"weekday": "Thursday"
},
"supported": true,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"sunset: the Hebrew day starts the evening before, so observance begins at sunset of the previous Gregorian day",
"holidays other than the seven listed, and Diaspora versus Israel second days",
"…1 more"
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}
},
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],
"x402Version": 1,
"alsoAvailable": {
"llms": "https://calendar-systems.x402tookit.com/llms.txt",
"catalog": "https://calendar-systems.x402tookit.com/catalog",
"message": "Calendar Systems has 12 pay-per-call endpoints (Date conversion and calendar facts for agents: Julian Day, Julian, Hebrew, Islamic tabular and Persian calendars, Chinese zodiac, moon phases and seasons.), from $0.02 a call. See the full menu and send your agents our way.",
"openapi": "https://calendar-systems.x402tookit.com/openapi.json",
"related": [
{
"url": "https://calendar-systems.x402tookit.com/islamic-calendar",
"path": "/islamic-calendar",
"what": "Convert a Gregorian date to the Islamic tabular civil calendar (or back); a calculated ap…",
"price": "$0.02"
},
{
"url": "https://calendar-systems.x402tookit.com/leap-year",
"path": "/leap-year",
"what": "Is a year a leap year in the Gregorian, Julian, Hebrew, Islamic (tabular) or Persian cale…",
"price": "$0.02"
},
{
"url": "https://calendar-systems.x402tookit.com/persian-calendar",
"path": "/persian-calendar",
"what": "Convert a Gregorian date to the Persian Solar Hijri calendar (or back) using the astronom…",
"price": "$0.02"
}
]
}
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.02USDC≈ $0.02 USD
on Base · exact scheme
Pay 0.02 USDC on Base to 0xb531…2DBDa. The signed payment is good for 5 minutes.
- Paid to
- 0xb531…2DBDa
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 20000 smallest units
20000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- DUPiup…eEm8s
- Token contract
- EPjFWd…TDt1v
- Payment window
- 5 minutes
20000units
on Polygon · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0x3c49…c3359
- Payment window
- 5 minutes
20000units
on Arbitrum · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0xaf88…e5831
- Payment window
- 5 minutes
The catalog’s raw entry
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{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"date": "2024-10-03"
}
},
"output": {
"type": "json",
"example": {
"asOf": "2026-10-11T08:54:32.855Z",
"from": "gregorian",
"hebrew": {
"day": 1,
"text": "1 Tishrei 5785",
"year": 5785,
"input": "5785-07-01",
"month": 7,
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"Hebrew days begin at sunset: the evening before the Gregorian date belongs to the Hebrew date shown."
],
"summary": "2024-10-03 (Thursday) is 1 Tishrei 5785 in the Hebrew calendar.",
"verdict": "CONVERTED",
"weekday": "Thursday",
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"sunset: the Hebrew day starts the evening before, so observance begins at sunset of the previous Gregorian day",
"holidays other than the seven listed, and Diaspora versus Israel second days",
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"schema": {
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"queryParams": {
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"properties": {
"date": {
"type": "string",
"description": "YYYY-MM-DD, in the Gregorian calendar (default) or in the hebrew calendar when from=hebrew"
},
"from": {
"enum": [
"gregorian",
"hebrew"
],
"type": "string",
"description": "gregorian (default) or hebrew: which calendar the date is written in"
}
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"additionalProperties": false
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}
}Provenance
- Seen in the source catalog
- 2026-10-20 20:58Z
- Last indexed by Roundhouse
- 2026-10-22 12:40Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 22:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Calendar Systems and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Calendar%20Systems' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://calendar-systems.x402tookit.com/hebrew-calendar, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.