Overview
Liturgical Calendar works by analyzing the data provided and returning the dates of the Liturgical Calendar for a given year. It uses various sources to determine the data and returns the dates.
Endpoint
One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.
curl "https://api.apiverve.com/v1/liturgicalcalendar?month=2&year=2025" \
-H "x-api-key: your_api_key_here"const res = await fetch('https://api.apiverve.com/v1/liturgicalcalendar?month=2&year=2025', {
headers: { 'x-api-key': 'your_api_key_here' },
});
if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);
const { data } = await res.json();
console.log(data);import requests
res = requests.get(
"https://api.apiverve.com/v1/liturgicalcalendar?month=2&year=2025",
headers={"x-api-key": "your_api_key_here"},
timeout=15,
)
res.raise_for_status()
print(res.json()["data"])package main
import (
"fmt"
"io"
"net/http"
)
func main() {
req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/liturgicalcalendar?month=2&year=2025", nil)
req.Header.Set("x-api-key", "your_api_key_here")
res, err := http.DefaultClient.Do(req)
if err != nil {
panic(err)
}
defer res.Body.Close()
out, _ := io.ReadAll(res.Body)
fmt.Println(string(out))
}Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.
Authentication
Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.
401 is the only auth verdict
A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.
Parameters
Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them.
| Parameter | Type | Description |
|---|---|---|
monthOptional | integer | The month to get Liturgical Calendar data for (default: current month) range 1–12 |
yearOptionalPremium | integer | The year to get Liturgical Calendar data for (default: current year) range 1900–2100 |
Response
Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.
{
"status": "ok",
"error": null,
"data": {
"2026-01-01": [
{
"id": "mary_mother_of_god",
"precedence": "GENERAL_SOLEMNITY_3",
"rank": "SOLEMNITY",
"isHolyDayOfObligation": true,
"isOptional": false,
"colors": [
"WHITE"
]
}
],
"2026-01-02": [
{
"id": "basil_the_great_and_gregory_nazianzen_bishops",
"precedence": "GENERAL_MEMORIAL_10",
"rank": "MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
],
"weekday": {
"id": "christmas_time_january_2",
"date": "2026-01-02",
"dateDef": {
"dateFn": "weekdayBeforeEpiphany",
"dateArgs": [
2
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:christmas_time.before_epiphany",
{
"day": 2
}
],
"seasons": [
"CHRISTMAS_TIME"
],
"periods": [
"DAYS_BEFORE_EPIPHANY",
"CHRISTMAS_TO_PRESENTATION_OF_THE_LORD"
],
"colors": [
"WHITE"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 9,
"dayOfWeek": 5,
"nthDayOfWeekInMonth": 1,
"startOfSeason": "2025-12-25",
"endOfSeason": "2026-01-11",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"CHRISTMAS_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2026-01-03": [
{
"id": "christmas_time_january_3",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
]
},
{
"id": "most_holy_name_of_jesus",
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": true,
"colors": [
"WHITE"
],
"weekday": {
"id": "christmas_time_january_3",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
]
}
}
],
"2026-01-04": [
{
"id": "second_sunday_after_christmas",
"precedence": "UNPRIVILEGED_SUNDAY_6",
"rank": "SUNDAY",
"isHolyDayOfObligation": true,
"isOptional": false,
"colors": [
"WHITE"
]
}
],
"2026-01-05": [
{
"id": "christmas_time_january_5",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
]
}
],
"2026-01-06": [
{
"id": "epiphany_of_the_lord",
"precedence": "PROPER_OF_TIME_SOLEMNITY_2",
"rank": "SOLEMNITY",
"isHolyDayOfObligation": true,
"isOptional": false,
"colors": [
"WHITE"
]
}
],
"2026-01-07": [
{
"id": "wednesday_after_epiphany",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
]
},
{
"id": "raymond_of_penyafort_priest",
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": true,
"colors": [
"WHITE"
],
"weekday": {
"id": "wednesday_after_epiphany",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
]
}
}
],
"2026-01-08": [
{
"id": "thursday_after_epiphany",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
]
}
],
"2026-01-09": [
{
"id": "friday_after_epiphany",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
]
}
],
"2026-01-10": [
{
"id": "saturday_after_epiphany",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
]
}
],
"2026-01-11": [
{
"id": "baptism_of_the_lord",
"precedence": "PROPER_OF_TIME_SOLEMNITY_2",
"rank": "SOLEMNITY",
"isHolyDayOfObligation": true,
"isOptional": false,
"colors": [
"WHITE"
]
}
],
"2026-01-12": [
{
"id": "ordinary_time_1_monday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-13": [
{
"id": "ordinary_time_1_tuesday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
},
{
"id": "hilary_of_poitiers_bishop",
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": true,
"colors": [
"WHITE"
],
"weekday": {
"id": "ordinary_time_1_tuesday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
}
],
"2026-01-14": [
{
"id": "ordinary_time_1_wednesday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-15": [
{
"id": "ordinary_time_1_thursday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-16": [
{
"id": "ordinary_time_1_friday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-17": [
{
"id": "anthony_of_egypt_abbot",
"precedence": "GENERAL_MEMORIAL_10",
"rank": "MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
],
"weekday": {
"id": "ordinary_time_1_saturday",
"date": "2026-01-17",
"dateDef": {
"dateFn": "dateOfOrdinaryTime",
"dateArgs": [
6,
1
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:ordinary_time.weekday",
{
"week": 1,
"dow": 6
}
],
"seasons": [
"ORDINARY_TIME"
],
"periods": [
"EARLY_ORDINARY_TIME"
],
"colors": [
"GREEN"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 1,
"dayOfSeason": 6,
"dayOfWeek": 6,
"nthDayOfWeekInMonth": 3,
"startOfSeason": "2026-01-12",
"endOfSeason": "2026-11-28",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ORDINARY_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_1"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2026-01-18": [
{
"id": "ordinary_time_2_sunday",
"precedence": "UNPRIVILEGED_SUNDAY_6",
"rank": "SUNDAY",
"isHolyDayOfObligation": true,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-19": [
{
"id": "ordinary_time_2_monday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-20": [
{
"id": "ordinary_time_2_tuesday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
},
{
"id": "fabian_i_pope",
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": true,
"colors": [
"RED"
],
"weekday": {
"id": "ordinary_time_2_tuesday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
},
{
"id": "sebastian_of_milan_martyr",
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": true,
"colors": [
"RED"
],
"weekday": {
"id": "ordinary_time_2_tuesday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
}
],
"2026-01-21": [
{
"id": "agnes_of_rome_virgin",
"precedence": "GENERAL_MEMORIAL_10",
"rank": "MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"RED"
],
"weekday": {
"id": "ordinary_time_2_wednesday",
"date": "2026-01-21",
"dateDef": {
"dateFn": "dateOfOrdinaryTime",
"dateArgs": [
3,
2
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:ordinary_time.weekday",
{
"week": 2,
"dow": 3
}
],
"seasons": [
"ORDINARY_TIME"
],
"periods": [
"EARLY_ORDINARY_TIME"
],
"colors": [
"GREEN"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 10,
"dayOfWeek": 3,
"nthDayOfWeekInMonth": 3,
"startOfSeason": "2026-01-12",
"endOfSeason": "2026-11-28",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ORDINARY_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_2"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2026-01-22": [
{
"id": "ordinary_time_2_thursday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
},
{
"id": "vincent_of_saragossa_deacon",
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": true,
"colors": [
"RED"
],
"weekday": {
"id": "ordinary_time_2_thursday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
}
],
"2026-01-23": [
{
"id": "ordinary_time_2_friday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-24": [
{
"id": "francis_de_sales_bishop",
"precedence": "GENERAL_MEMORIAL_10",
"rank": "MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
],
"weekday": {
"id": "ordinary_time_2_saturday",
"date": "2026-01-24",
"dateDef": {
"dateFn": "dateOfOrdinaryTime",
"dateArgs": [
6,
2
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:ordinary_time.weekday",
{
"week": 2,
"dow": 6
}
],
"seasons": [
"ORDINARY_TIME"
],
"periods": [
"EARLY_ORDINARY_TIME"
],
"colors": [
"GREEN"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 2,
"dayOfSeason": 13,
"dayOfWeek": 6,
"nthDayOfWeekInMonth": 4,
"startOfSeason": "2026-01-12",
"endOfSeason": "2026-11-28",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ORDINARY_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_2"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2026-01-25": [
{
"id": "sunday_of_the_word_of_god",
"precedence": "UNPRIVILEGED_SUNDAY_6",
"rank": "SUNDAY",
"isHolyDayOfObligation": true,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-26": [
{
"id": "timothy_of_ephesus_and_titus_of_crete_bishops",
"precedence": "GENERAL_MEMORIAL_10",
"rank": "MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
],
"weekday": {
"id": "ordinary_time_3_monday",
"date": "2026-01-26",
"dateDef": {
"dateFn": "dateOfOrdinaryTime",
"dateArgs": [
1,
3
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:ordinary_time.weekday",
{
"week": 3,
"dow": 1
}
],
"seasons": [
"ORDINARY_TIME"
],
"periods": [
"EARLY_ORDINARY_TIME"
],
"colors": [
"GREEN"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 3,
"dayOfSeason": 15,
"dayOfWeek": 1,
"nthDayOfWeekInMonth": 4,
"startOfSeason": "2026-01-12",
"endOfSeason": "2026-11-28",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ORDINARY_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_3"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2026-01-27": [
{
"id": "ordinary_time_3_tuesday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
},
{
"id": "angela_merici_virgin",
"precedence": "OPTIONAL_MEMORIAL_12",
"rank": "OPTIONAL_MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": true,
"colors": [
"WHITE"
],
"weekday": {
"id": "ordinary_time_3_tuesday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
}
],
"2026-01-28": [
{
"id": "thomas_aquinas_priest",
"precedence": "GENERAL_MEMORIAL_10",
"rank": "MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
],
"weekday": {
"id": "ordinary_time_3_wednesday",
"date": "2026-01-28",
"dateDef": {
"dateFn": "dateOfOrdinaryTime",
"dateArgs": [
3,
3
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:ordinary_time.weekday",
{
"week": 3,
"dow": 3
}
],
"seasons": [
"ORDINARY_TIME"
],
"periods": [
"EARLY_ORDINARY_TIME"
],
"colors": [
"GREEN"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 3,
"dayOfSeason": 17,
"dayOfWeek": 3,
"nthDayOfWeekInMonth": 4,
"startOfSeason": "2026-01-12",
"endOfSeason": "2026-11-28",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ORDINARY_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_3"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
],
"2026-01-29": [
{
"id": "ordinary_time_3_thursday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-30": [
{
"id": "ordinary_time_3_friday",
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"GREEN"
]
}
],
"2026-01-31": [
{
"id": "john_bosco_priest",
"precedence": "GENERAL_MEMORIAL_10",
"rank": "MEMORIAL",
"isHolyDayOfObligation": false,
"isOptional": false,
"colors": [
"WHITE"
],
"weekday": {
"id": "ordinary_time_3_saturday",
"date": "2026-01-31",
"dateDef": {
"dateFn": "dateOfOrdinaryTime",
"dateArgs": [
6,
3
],
"yearOffset": 0
},
"dateExceptions": [],
"alternativeTransferDateDefs": [],
"precedence": "WEEKDAY_13",
"rank": "WEEKDAY",
"allowSimilarRankItems": false,
"isHolyDayOfObligation": false,
"isOptional": false,
"i18nDef": [
"seasons:ordinary_time.weekday",
{
"week": 3,
"dow": 6
}
],
"seasons": [
"ORDINARY_TIME"
],
"periods": [
"EARLY_ORDINARY_TIME"
],
"colors": [
"GREEN"
],
"commonsDef": [],
"martyrology": [],
"titles": [],
"calendar": {
"weekOfSeason": 3,
"dayOfSeason": 20,
"dayOfWeek": 6,
"nthDayOfWeekInMonth": 5,
"startOfSeason": "2026-01-12",
"endOfSeason": "2026-11-28",
"startOfLiturgicalYear": "2025-11-30",
"endOfLiturgicalYear": "2026-11-28",
"seasons": [
"ORDINARY_TIME"
]
},
"cycles": {
"properCycle": "PROPER_OF_TIME",
"sundayCycle": "YEAR_A",
"weekdayCycle": "YEAR_2",
"psalterWeek": "WEEK_3"
},
"fromCalendarId": "ProperOfTime",
"fromExtendedCalendars": []
}
}
]
}
}Response fields
Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.
| Field | Type | Example | Description |
|---|---|---|---|
2026-01-01 | array[1] | ||
id | string | "mary_mother_of_god" | Unique identifier for the liturgical event |
precedencePremium | string | "GENERAL_SOLEMNITY_3" | Liturgical rank precedence level for the event |
rank | string | "SOLEMNITY" | Liturgical rank classification (e.g., WEEKDAY, FEAST) |
isHolyDayOfObligation | boolean | true | Whether event is a holy day of obligation |
isOptional | boolean | false | Whether the event is optional to observe |
colors | array | [WHITE] | Liturgical colors for the event (e.g., PURPLE, WHITE) |
2026-01-02 | array[1] | ||
id | string | "basil_the_great_and_gregory_nazianzen_bishops" | Unique identifier for the liturgical event |
precedencePremium | string | "GENERAL_MEMORIAL_10" | Liturgical rank precedence level for the event |
rank | string | "MEMORIAL" | Liturgical rank classification (e.g., WEEKDAY, FEAST) |
isHolyDayOfObligation | boolean | false | Whether event is a holy day of obligation |
isOptional | boolean | false | Whether the event is optional to observe |
colors | array | [WHITE] | Liturgical colors for the event (e.g., PURPLE, WHITE) |
weekday | object | {...} | |
id | string | "christmas_time_january_2" | Unique identifier for the liturgical event |
date | string | "2026-01-02" | ISO date string for the liturgical event |
dateDef | object | {...} | |
dateFn | string | "weekdayBeforeEpiphany" | |
dateArgs | array | [2] | |
yearOffset | number | 0 | |
dateExceptions | array | [] | |
alternativeTransferDateDefs | array | [] | |
precedencePremium | string | "WEEKDAY_13" | Liturgical rank precedence level for the event |
rank | string | "WEEKDAY" | Liturgical rank classification (e.g., WEEKDAY, FEAST) |
allowSimilarRankItems | boolean | false | Whether similar rank items allowed on same date |
isHolyDayOfObligation | boolean | false | Whether event is a holy day of obligation |
isOptional | boolean | false | Whether the event is optional to observe |
i18nDefPremium | array | [seasons:christmas_time.before_epiphany, ...] | Internationalization definition for event naming |
seasons | array | [CHRISTMAS_TIME] | Array of liturgical seasons (e.g., ADVENT, LENT) |
periods | array | [DAYS_BEFORE_EPIPHANY, ...] | |
colors | array | [WHITE] | Liturgical colors for the event (e.g., PURPLE, WHITE) |
commonsDef | array | [] | |
martyrology | array | [] | |
titles | array | [] | |
calendar | object | {...} | |
weekOfSeason | number | 2 | |
dayOfSeason | number | 9 | |
dayOfWeek | number | 5 | |
nthDayOfWeekInMonth | number | 1 | |
startOfSeason | string | "2025-12-25" | |
endOfSeason | string | "2026-01-11" | |
startOfLiturgicalYear | string | "2025-11-30" | |
endOfLiturgicalYear | string | "2026-11-28" | |
seasons | array | [CHRISTMAS_TIME] | Array of liturgical seasons (e.g., ADVENT, LENT) |
cycles | object | {...} | |
properCycle | string | "PROPER_OF_TIME" | |
sundayCycle | string | "YEAR_A" | |
weekdayCycle | string | "YEAR_2" | |
psalterWeek | string | "WEEK_1" | |
fromCalendarIdPremium | string | "ProperOfTime" | Source calendar identifier for the event |
fromExtendedCalendars | array | [] | |
2026-01-03 | array[2] | ||
id | string | "christmas_time_january_3" | Unique identifier for the liturgical event |
precedencePremium | string | "WEEKDAY_13" | Liturgical rank precedence level for the event |
rank | string | "WEEKDAY" | Liturgical rank classification (e.g., WEEKDAY, FEAST) |
isHolyDayOfObligation | boolean | false | Whether event is a holy day of obligation |
isOptional | boolean | false | Whether the event is optional to observe |
colors | array | [WHITE] | Liturgical colors for the event (e.g., PURPLE, WHITE) |
2026-01-04 | array[1] | ||
id | string | "second_sunday_after_christmas" | Unique identifier for the liturgical event |
precedencePremium | string | "UNPRIVILEGED_SUNDAY_6" | Liturgical rank precedence level for the event |
rank | string | "SUNDAY" | Liturgical rank classification (e.g., WEEKDAY, FEAST) |
isHolyDayOfObligation | boolean | true | Whether event is a holy day of obligation |
isOptional | boolean | false | Whether the event is optional to observe |
colors | array | [WHITE] | Liturgical colors for the event (e.g., PURPLE, WHITE) |
2026-01-05 | array[1] | ||
id | string | "christmas_time_january_5" | Unique identifier for the liturgical event |
precedencePremium | string | "WEEKDAY_13" | Liturgical rank precedence level for the event |
rank | string | "WEEKDAY" | Liturgical rank classification (e.g., WEEKDAY, FEAST) |
isHolyDayOfObligation | boolean | false | Whether event is a holy day of obligation |
isOptional | boolean | false | Whether the event is optional to observe |
colors | array | [WHITE] | Liturgical colors for the event (e.g., PURPLE, WHITE) |
2026-01-06 | array[1] | ||
id | string | "epiphany_of_the_lord" | Unique identifier for the liturgical event |
precedencePremium | string | "PROPER_OF_TIME_SOLEMNITY_2" | Liturgical rank precedence level for the event |
rank | string | "SOLEMNITY" | Liturgical rank classification (e.g., WEEKDAY, FEAST) |
isHolyDayOfObligation | boolean | true | Whether event is a holy day of obligation |
isOptional | boolean | false | Whether the event is optional to observe |
colors | array | [WHITE] | Liturgical colors for the event (e.g., PURPLE, WHITE) |
Errors
Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.
| Status | Meaning | What to do |
|---|---|---|
400 | Input was rejected | Read error; it names the parameter. |
401 | Key missing or invalid | Check the header name and the key value. |
403 | Key valid, but not permitted | A key restriction or IP allow-list; see key scoping. |
429 | Rate limited, or out of credits | Read error to tell them apart; see rate limits. |
Other ways to use Liturgical Calendar
Set up Liturgical Calendar on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.
Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKit →Reference →
Use it in Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheets →Reference →
Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →
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