Regional calendar: convert a Gregorian date

POST

/vedic/calendar/regional/date

request.sh

curl -X POST https://api.astroway.info/v1/vedic/calendar/regional/date \
  -H "X-Api-Key: aw_live_..." \
  -H "Content-Type: application/json" \
  -d '{ "calendar": "malayalam", "date": "2026-08-17", "latitude": 9.9312, "longitude": 76.2673, "timezone": "Asia/Kolkata" }'

▸ Try it POST /vedic/calendar/regional/date

• Production

One Gregorian date in a regional calendar at the place. Solar calendars (tamil, malayalam, bengali): month, its number, day of the month and the era year. Lunisolar (gujarati, marathi): amanta month, the tithi at local sunrise with its paksha (Sud and Vad for Gujarati), adhika flag and the era year. Each answer carries the month’s first and last civil day and the rule used.

Authorizations

• ApiKeyAuth

Parameters

Query Parameters

fields

string

Comma-separated dotted paths, relative to data, to keep in the response. A path is applied to every element of an array, so planets.name means the name of each planet. Paths that match nothing come back in _fields_unmatched; a list where nothing matches at all is a 400, because an empty object would be a confident wrong answer.

Example

planets.name,planets.longitude

precision

integer

<= 15

Round every non-integer number in the response to this many decimal places. Integers are left alone, because an id is not a measurement. Ecliptic longitudes ship with fourteen decimals by default; 2 is about a tenth of an arcminute.

Example

4

Header Parameters

Idempotency-Key

string

>= 1 characters <= 255 characters /^[\x21-\x7E]+$/

Unique per logical operation, kept across retries. For 24 hours from the first request, a repeat with the same key, method, path, body and query string returns the stored response with Idempotent-Replayed: true and costs 0 credits. The same key with a different body or query string is a 409 IDEMPOTENCY_KEY_REUSED; a repeat while the first is still running is a 409 IDEMPOTENCY_IN_PROGRESS. Only 2xx responses are kept. See /idempotency/.

Example

01HXY2A7ZM0ABCDEF

Request Body ^required

Media type application/json

A regional calendar, a Gregorian date and a place.

object

calendar required

Tamil, malayalam, bengali (solar months from the sankranti by each region’s rule), gujarati (amanta, Vikram Samvat from Kartika), marathi (amanta, Shaka from Chaitra).

string

Allowed values: tamil malayalam bengali gujarati marathi

date required

Gregorian date, YYYY-MM-DD, local to the place.

string

/^\d{4}-\d{2}-\d{2}$/

latitude required

Latitude in decimal degrees, north positive. Between -66 and 66: further out the Sun does not rise on some days and a Hindu day has no start.

number

nullable >= -66 <= 66

longitude required

Longitude in decimal degrees, east positive.

number

nullable >= -180 <= 180

timezone

IANA zone name such as Asia/Kolkata, America/New_York or Europe/Kyiv, or auto (default) to look it up from the coordinates. Resolved day by day: each day is read on the offset that zone kept that day, so summer time is followed.

string

>= 1 characters <= 64 characters

timezoneOffset

A fixed offset in hours instead of a zone, for the whole year. Ignored when timezone is sent.

number

nullable >= -14 <= 14

ayanamsaId

number

nullable

ayanamsa

Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.

string

Allowed values: fagan-bradley lahiri de-luce raman krishnamurti kp yukteshwar jn-bhasin true-citra djwhal-khul

Example

{
  "calendar": "malayalam",
  "date": "2026-08-17",
  "latitude": 9.9312,
  "longitude": 76.2673,
  "timezone": "Asia/Kolkata"
}

Responses

200

Successful calculation

Media type application/json

object

ok

boolean

data

object

calendar

string

nullable

date

string

nullable

month

string

nullable

monthNumber

number

nullable

day

number

nullable

tithi

nullable

adhika

boolean

nullable

year

object

era

string

nullable

number

number

nullable

name

nullable

monthStart

string

nullable

monthEnd

string

nullable

rule

string

nullable

place

object

latitude

number

nullable

longitude

number

nullable

timezone

string

nullable

timezoneOffset

nullable

ayanamsaId

number

nullable

Example

{
  "ok": true,
  "data": {
    "calendar": "malayalam",
    "date": "2026-08-17",
    "month": "Chingam",
    "monthNumber": 1,
    "day": 1,
    "tithi": null,
    "adhika": false,
    "year": {
      "era": "Kollam",
      "number": 1202,
      "name": null
    },
    "monthStart": "2026-08-17",
    "monthEnd": "2026-09-16",
    "rule": "A month begins on the day of the sankranti when it falls within the first three fifths of daylight (to the end of madhyahna), otherwise on the next day.",
    "place": {
      "latitude": 9.9312,
      "longitude": 76.2673,
      "timezone": "Asia/Kolkata",
      "timezoneOffset": null,
      "ayanamsaId": 1
    }
  }
}

400

Validation error

Media type application/json

Example

{
  "ok": false,
  "error": {
    "code": "INVALID_INPUT",
    "message": "Validation failed: date: Date must be YYYY-MM-DD",
    "details": [
      {
        "path": "date",
        "message": "Date must be YYYY-MM-DD"
      }
    ]
  }
}

401

Missing or invalid API key

Media type application/json

Example

{
  "ok": false,
  "error": {
    "code": "INVALID_API_KEY",
    "message": "Invalid API key"
  }
}